Negative words that start with O usually describe unfriendly actions, rude manners, or unpleasant attitudes. Examples include “obnoxious,” “offend,” and “oppress,” which all signal negative behavior or strong criticism. Learning such words helps readers notice when language carries a sharp or harsh meaning in English.
This post offers negative words that start with o, giving learners useful vocabulary to understand and improve English expression more effectively.
List of Negative Words That Start With O
| Offend | Oppose | Obsolete |
| Odious | Obstruct | Outraged |
| Obscene | Obdurate | Overreact |
| Oppressive | Overcharge | Overdemanding |
| Overjealous | Overfearful | Overentitled |
| Outlaw | Outrageous | Overhostile |
| Obloquy | Overmalicious | Overwrought |
| Overcomplaining | Overdrinking | Overpossessive |
| Overdoubtful | Overharassing | Overwicked |
| Overarguing | Overnighty | Outcast |
| Onerous | Overvengeful | Overcholeric |
| Overindulging | Overyelling | Overstep |
| Overbrutal | Overhateful | Overworried |
| Overkill | Overthetop | Outtaline |
| Oldhag | Off-key | Outtashape |
| Overhyped | Outlandish | Outta luck |
| Overcriticizing | Overopinionated | Opportunistic |
| Overdemand | Outsmarted | Overanxious |
| Overdefensive | Outplayed | Overcomplicating |
| Overstrict | Overcautious | Overanalyzed |
| Outshined | Overthoughtful | Overmessy |
| Overpicky | Overboastful | Outshouter |
| Overfearsome | Overtemper | Outtamed |
| Overdriven | Overrude | Overpainful |
| Outsnob | Overgreedy | Overneedy |
| Overreacting | Overhostility | Overquarrelsome |
| Outworked | Overheated | Overpunishing |
| Overargued | Overtroubled | Overtalking |
| Overcomplain | Overcrying | Overblaming |
Negative Words That Start With O (With Meanings & Sentences)
| Word | Meaning | Example Sentence |
|---|---|---|
| Obnoxious | Extremely unpleasant or offensive | His obnoxious behavior ruined the party. |
| Odious | Hateful and disgusting | The odious smell made everyone leave the room. |
| Offensive | Causing hurt or insult | The joke was highly offensive to many people. |
| Oppressive | Unjustly harsh or burdensome | The oppressive heat made it hard to breathe. |
| Obscene | Indecent or shocking | He was fined for using obscene language. |
| Obstinate | Stubborn and unwilling to change | She remained obstinate despite clear evidence. |
| Overbearing | Bossy and dominating | His overbearing tone silenced the team. |
| Outrageous | Extremely shocking or unreasonable | The bill was outrageous for such poor service. |
| Overcritical | Too quick to judge harshly | She is overcritical of every small mistake. |
| Ominous | Suggesting something bad will happen | Dark clouds gave an ominous warning of a storm. |
| Overreact | Respond too strongly | Don’t overreact to a small problem. |
| Obdurate | Refusing to change feelings or actions | The obdurate man ignored all advice. |
| Overanxious | Excessively worried | Parents can be overanxious about their kids. |
| Outlaw | A criminal or fugitive | The outlaw was finally caught by the police. |
| Overdemanding | Asking for too much | The boss was overdemanding of his staff. |
| Oppose | To resist or fight against | They oppose the unfair new policy. |
| Outcast | A person rejected by society | He felt like an outcast after losing his job. |
| Overjealous | Showing extreme jealousy | She became overjealous of her sister’s success. |
| Overbearing | Overly controlling | His overbearing parents made decisions for him. |
| Obsolete | Out of date; no longer useful | The machine became obsolete after new tech came. |
| Outburst | A sudden display of strong emotion | His angry outburst shocked the crowd. |
| Overindulge | Allow oneself too much of something | Kids often feel sick when they overindulge in sweets. |
| Overheated | Too hot or excited | The overheated debate led to an argument. |
| Overblown | Exaggerated beyond reason | The issue was completely overblown in the media. |
| Outrage | Intense anger | The decision caused public outrage. |
| Overworked | Made to work too much | Nurses are often overworked in hospitals. |
| Overhyped | Given more importance than deserved | The film was overhyped but not impressive. |
| Overstrict | Too severe in rules | His overstrict parents never let him go out. |
| Overcomplicate | Make something more difficult than needed | Don’t overcomplicate simple instructions. |
| Overboastful | Bragging too much | He sounded overboastful about his small success. |
Action Negative Words Starting With O
- Offend (to insult or hurt someone’s feelings)
- Oppose (to resist or fight against something)
- Overreact (to respond with extreme emotion or action)
- Overwhelm (to overpower emotionally or mentally)
- Obstruct (to block progress or movement)
- Overcharge (to demand too much money unfairly)
- Overcriticize (to judge too harshly or excessively)
- Overstep (to go beyond proper limits or boundaries)
- Ostracize (to exclude or shun someone from a group)
Emotion Negative Words With O
- Outraged (extremely angry or shocked)
- Overanxious (excessively nervous or uneasy)
- Overwrought (very upset or agitated)
- Overfearful (too afraid or worried)
- Overdoubtful (uncertain beyond reason)
- Overjealous (excessively envious or suspicious)
- Overworried (worried to an extreme degree)
- Overhateful (filled with too much hate)
- Overresentful (holding strong feelings of bitterness)
Personality Negative Words Beginning With O
- Obnoxious (extremely unpleasant or annoying)
- Overbearing (bossy and controlling)
- Opportunistic (taking selfish advantage of situations)
- Obstinate (stubborn and unwilling to change)
- Overcritical (finding fault too often)
- Overdemanding (asking too much from others)
- Overpossessive (excessively controlling in relationships)
- Opinionated (holding strong views, unwilling to listen)
- Overentitled (believing one deserves too much)
Behavior Negative Words Starting With O
- Overindulging (giving in too much to desires)
- Overarguing (arguing excessively or repeatedly)
- Overreacting (responding in an extreme way)
- Overcriticizing (finding faults constantly)
- Obstructing (blocking or hindering intentionally)
- Overdrinking (consuming too much alcohol)
- Overcomplaining (grumbling too often)
- Overyelling (shouting excessively)
- Overharassing (bothering or annoying repeatedly)
Harsh Negative Words With O
- Odious (hateful and disgusting)
- Obscene (offensively indecent or vulgar)
- Outrageous (shocking and offensive)
- Overbrutal (excessively cruel or violent)
- Overhostile (too aggressive or unfriendly)
- Overmalicious (too spiteful and harmful)
- Overrude (extremely impolite)
- Oppressive (harsh and unfairly controlling)
- Overwicked (extremely evil or immoral)
Rare Negative Words Beginning With O
- Obloquy (strong public criticism or disgrace)
- Opprobrious (expressing scorn or shame)
- Onerous (extremely difficult and burdensome)
- Overweening (arrogant and overconfident)
- Outlandish (very strange and bizarre)
- Overnasty (excessively unpleasant)
- Obdurate (stubbornly refusing to change)
- Overvengeful (too eager for revenge)
- Overcholeric (excessively bad-tempered)
Slang Negative Words Starting With O
- Outta line (acting improperly or disrespectfully)
- Old hag (an insulting term for an unpleasant old woman)
- Outta luck (having no chance or opportunity)
- Over the top (excessively dramatic or extreme)
- Overkill (doing far more than needed)
- Outcast (a rejected or excluded person)
- Off-key (socially awkward or out of place)
- Outta shape (unfit or in poor physical condition)
- Overhyped (given too much attention without real value)
3 Letter Negative Words That Start With O
- Odd
- Off
- Out
- Oaf
- Oho
- Ohs
- Owl
- Ode
- Ops
- Ooz
4 Letter Negative Words That Start With O
- Oafs
- Omit
- Odor
- Ogre
- Ouch
- Oozy
- Oust
- Opal
- Owed
- Oath
5 Letter Negative Words That Start With O
- Offal
- Outdo
- Overt
- Ogres
- Outed
- Outgo
- Onset
- Obese
- Odium
- Oxide
6 Letter Negative Words That Start With O
- Offend
- Outlaw
- Orphan
- Outcry
- Outwit
- Outrun
- Output
- Opaque
- Outage
- Obsess
7 Letter Negative Words That Start With O
- Obnoxio
- Obscure
- Outrage
- Oppress
- Overrun
- Overeat
- Outlast
- Oddness
- Obtrude
- Odorous
8 Letter Negative Words That Start With O
- Offensive
- Obstinate
- Obdurate
- Outdated
- Overkill
- Overcome
- Overload
- Obscured
- Opposing
- Obsessed
9 Letter Negative Words That Start With O
- Opprobrious
- Overbearing
- Outlandish
- Overridden
- Overheated
- Overcritical
- Overzealous
- Obnoxious
- Oppressor
- Objection
Negative Words Starting With O With Double Letters
- Offend
- Offering
- Official
- Oppose
- Oppress
- Occult
- Occasion
- Oddity
- Odder
- Oozing
