All Adverbs that Start With O

Adverbs are essential parts of speech that modify verbs, adjectives, or other adverbs. They add depth and meaning to sentences and are used to describe how actions are performed.

With over 6,000 adverbs in the English language, it’s not always easy to find the right one for a particular sentence. That’s why we’ve compiled a list of 150 Adverbs Starting with O to help you enhance your writing.

In this article, we’ll explore a variety of adverbs starting with the letter O.

Whether you’re looking for words to describe an action that is done quickly like “outstandingly” or want to convey how something is being observed like “obviously,” this comprehensive list has got you covered.

Adverbs that Start With O

Below are 30 Top Adverbs That Start with O, along with meaning and example sentences. (Skip to Complete List)

1. Obviously

Meaning: In a way that is easily perceived or understood; clearly.

Example: He was obviously upset about the news.

2. Occasionally

Meaning: At infrequent or irregular intervals; now and then.

Example: She visits her hometown occasionally.

3. Outwardly

Meaning: On the surface; to all outward appearances.

Example: Outwardly, he seemed confident, but inside he was nervous.

4. Overly

Meaning: Excessively.

Example: The dish was overly seasoned.

5. Ominously

Meaning: In a way that suggests that something bad is going to happen.

Example: The sky darkened ominously.

6. Openly

Meaning: Without concealment; frankly.

Example: She spoke openly about her struggles.

7. Originally

Meaning: At first; initially.

Example: Originally, we planned to travel in June.

8. Overwhelmingly

Meaning: To a very great degree or with a great majority.

Example: The motion was overwhelmingly approved.

9. Oddly

Meaning: In a strange or unusual manner.

Example: He reacted oddly to the question.

10. Officially

Meaning: In a formal and public manner.

Example: The project was officially launched yesterday.

11. Objectively

Meaning: In a manner that is not influenced by personal feelings or opinions.

Example: The judge has to consider the evidence objectively.

12. Ostensibly

Meaning: Apparently or purportedly, but perhaps not actually.

Example: He was ostensibly there for a business trip.

13. Overnight

Meaning: For the duration of a night.

Example: The city changed almost overnight.

14. Optimally

Meaning: In the best possible manner; most favorably or advantageously.

Example: To function optimally, the machine requires regular maintenance.

15. Outlandishly

Meaning: In a bizarre or unfamiliar manner.

Example: She dressed rather outlandishly for the event.

16. Oppressively

Meaning: In a harsh or cruel manner.

Example: The sun beat down oppressively.

17. Orally

Meaning: By means of speech; verbally.

Example: The instructions were given orally.

18. Obligingly

Meaning: In a willing or accommodating manner.

Example: He obligingly opened the door for her.

19. Organically

Meaning: In a manner that is free from pesticides and synthetic fertilizers.

Example: The vegetables are grown organically.

20. Outrageously

Meaning: In a manner that is shockingly bad or excessive.

Example: The prices are outrageously high.

21. Offensively

Meaning: In a manner that causes annoyance or resentment.

Example: He spoke offensively about her background.

22. Ordinarily

Meaning: Usually; generally.

Example: I don’t ordinarily drink coffee.

23. Overtly

Meaning: In an open and unsecretive manner.

Example: He did not overtly express his discontent.

24. Obsessively

Meaning: In a relentless or excessive manner.

Example: He checked his phone obsessively.

25. Obstinately

Meaning: In a stubbornly unyielding or inflexible manner.

Example: She held on obstinately to her beliefs.

26. Opportunely

Meaning: In a manner that is suitable or convenient for a particular occurrence.

Example: The rain stopped opportunely just as the event began.

27. Outright

Meaning: Completely or immediately.

Example: She denied the accusations outright.

28. Outstandingly

Meaning: In an exceptional manner.

Example: She performed outstandingly in the exams.

29. Overarchingly

Meaning: In a comprehensive or dominant manner.

Example: The theme overarchingly represented in the film is love.

30. Overtiringly

Meaning: In a manner that causes excessive fatigue.

Example: The journey was long and overtiringly tedious.

All Adverbs Starting With O

Oathfully	Obdurately	Obediently
Obeisantly	Obeyingly	Obiter
Obituarily	Objectively	Obligatorily
Obligedly	Obligingly	Obliquely
Obliviously	Oblongly	Obnoxiously
Obscenely	Obscurely	Obsequiously
Observably	Observantly	Observingly
Obsessively	Obsoletely	Obstinately
Obstreperously	Obtrusively	Obtusely
Obversely	Obviously	Occasionally
Occultly	Ocularly	Oddly
Odiously	Odorously	Offendedly
Offensively	Offhandedly	Officially
Officiously	Often	Oftentimes
Ofttimes	Oilily	Ominously
Omnipotently	Once	Onerously
Ones	Online	Only
Onto	Onward	Onwards
Opaquely	Openhandedly	Openly
Operosely	Opinionatedly	Opportunely
Opportunistically	Opposite	Oppositely
Oppressively	Optatively	Optically
Optimally	Optimistically	Optionally
Opulently	Oracularly	Orally
Ordinarily	Ordinately	Organizationally
Originally	Ornamentally	Ornately
Ornerily	Orthodoxly	Oscitantly
Ostensibly	Ostentatiously	Other
Othergates	Others	Otherways
Otherwhere	Otherwise	Outcept
Outdoors	Outerly	Outlandishly
Outragedly	Outrageously	Outrightly
Outside	Outspokenly	Outward
Outwardly	Outwards	Ovally
Over	Overall	Overbearingly
Overboard	Overconfidently	Overhead
Overhighly	Overleaf	Overly
Overmore	Overmuch	Overprotectively
Overseas	Overside	Oversoon
Overtime	Overtly	Overwhelmingly
Owlishly	Oxymoronically