| obdurately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obstinately, pig-headedly, stubbornly |
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| obediently | (adverb) in an obedient manner | Synonyms: yieldingly |
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| objectionably | (adverb) in an obnoxious manner | Synonyms: obnoxiously, offensively |
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| objectively | (adverb) with objectivity | - |
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| obligatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, mandatorily |
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| (adverb) in an obligatory manner | - |
| obligingly | (adverb) in accommodation | Synonyms: accommodatingly |
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| obliquely | (adverb) at an oblique angle | Synonyms: aslant, athwart |
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| (adverb) to, toward or at one side | Synonyms: sidelong, sideways |
| obnoxiously | (adverb) in an obnoxious manner | Synonyms: objectionably, offensively |
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| obscenely | (adverb) in a lewd and obscene manner | Synonyms: lewdly |
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| (adverb) to an obscene degree | - |
| obscurely | (adverb) in an obscure manner | - |
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| obsequiously | (adverb) in an obsequious manner | Synonyms: servilely, subserviently |
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| observably | (adverb) in a noticeable manner | Synonyms: noticeably, perceptibly |
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| observantly | (adverb) in an observant manner | Synonyms: observingly |
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| observingly | (adverb) in an observant manner | Synonyms: observantly |
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| obsessionally | (adverb) in a compulsive manner | Synonyms: compulsively, obsessively |
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| obsessively | (adverb) in a compulsive manner | Synonyms: compulsively, obsessionally |
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| obstinately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obdurately, pig-headedly, stubbornly |
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| obstreperously | (adverb) in manner that attracts attention | Synonyms: clamorously, loudly |
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| obstructively | (adverb) in an obstructive manner | Synonyms: hinderingly |
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| obtrusively | (adverb) in an obtrusive manner | - |
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| obtusely | (adverb) stupidly or insensitively | Synonyms: densely, dumbly |
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| obviously | (adverb) unmistakably (`plain' is often used informally for `plainly') | Synonyms: apparently, evidently, manifestly, patently, plain, plainly |
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| occasionally | (adverb) sporadically and infrequently | Synonyms: at times, from time to time, now and again, now and then, on occasion, once in a while |
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| oddly | (adverb) in a manner differing from the usual or expected | Synonyms: curiously, inexplicably, peculiarly |
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| (adverb) in a strange manner | Synonyms: funnily, queerly, strangely |
| odiously | (adverb) in an offensive and hateful manner | Synonyms: abominably, detestably, repulsively |
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| off | (adverb) at a distance in space or time | Synonyms: away |
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| (adverb) from a particular thing or place or position (`forth' is obsolete) | Synonyms: away, forth |
| (adverb) no longer on or in contact or attached | - |
| offensively | (adverb) aggressively | - |
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| (adverb) in an obnoxious manner | Synonyms: objectionably, obnoxiously |
| (adverb) in an unpleasantly offensive manner | - |
| offhand | (adverb) in a casually inconsiderate manner | Synonyms: offhanded, offhandedly |
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| (adverb) without previous thought or preparation | Synonyms: offhanded, offhandedly |
| offhanded | (adverb) in a casually inconsiderate manner | Synonyms: offhand, offhandedly |
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| (adverb) without previous thought or preparation | Synonyms: offhand, offhandedly |
| offhandedly | (adverb) in a casually inconsiderate manner | Synonyms: offhand, offhanded |
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| (adverb) without previous thought or preparation | Synonyms: offhand, offhanded |
| officially | (adverb) in an official role | - |
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| (adverb) with official authorization | Synonyms: formally |
| officiously | (adverb) in an officious manner | - |
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| offshore | (adverb) away from shore; away from land | - |
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| offside | (adverb) illegally in advance of the ball or puck | - |
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| offstage | (adverb) behind the scenes; not on stage | - |
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| (adverb) not in public | - |
| oft | (adverb) many times at short intervals | Synonyms: frequently, often, oftentimes, ofttimes |
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| often | (adverb) many times at short intervals | Synonyms: frequently, oft, oftentimes, ofttimes |
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| (adverb) frequently or in great quantities | Synonyms: a great deal, much |
| (adverb) in many cases or instances | - |
| oftener | (adverb) more often or more frequently | - |
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| oftentimes | (adverb) many times at short intervals | Synonyms: frequently, oft, often, ofttimes |
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| ofttimes | (adverb) many times at short intervals | Synonyms: frequently, oft, often, oftentimes |
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| okay | (adverb) in a satisfactory or adequate manner | Synonyms: all right, alright, O.K. |
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| ominously | (adverb) in an ominous manner | - |
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| on | (adverb) with a forward motion | Synonyms: along |
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| (adverb) indicates continuity or persistence or concentration | - |
| (adverb) in a state required for something to function or be effective | - |
| once | (adverb) on one occasion | Synonyms: in one case, one time |
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| (adverb) at a previous time | Synonyms: at one time, erst, erstwhile, formerly |
| (adverb) as soon as | - |
| onerously | (adverb) in an onerous manner | - |
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| only | (adverb) with nevertheless the final result | - |
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| (adverb) without any others being included or involved | Synonyms: alone, entirely, exclusively, solely |
| (adverb) and nothing more | Synonyms: but, just, merely, simply |
| (adverb) never except when | Synonyms: only if, only when |
| (adverb) in the final outcome | - |
| (adverb) as recently as | - |
| (adverb) except that | - |
| onshore | (adverb) on or toward the land | - |
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| onstage | (adverb) on the stage | - |
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| onward | (adverb) forward in time or order or degree | Synonyms: forth, forward |
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| (adverb) in a forward direction | Synonyms: ahead, forrader, forward, forwards, onwards |
| onwards | (adverb) in a forward direction | Synonyms: ahead, forrader, forward, forwards, onward |
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| opaquely | (adverb) in an opaque manner | - |
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| openly | (adverb) in an open way | - |
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| operationally | (adverb) in respect to operation | - |
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| operatively | (adverb) in a manner to produce an effect | - |
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| opportunely | (adverb) conveniently | - |
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| opposite | (adverb) directly facing each other | Synonyms: face-to-face, face to face |
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| oppositely | (adverb) in an opposite position | - |
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| oppressively | (adverb) in a heavy and oppressive way | - |
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| optically | (adverb) in an optical manner | - |
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| optimally | (adverb) in an optimal and most desirable way | - |
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| optimistically | (adverb) with optimism; in an optimistic manner | - |
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| optionally | (adverb) in an optional manner | - |
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| opulently | (adverb) in a sumptuous and opulent manner | Synonyms: sumptuously |
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| orad | (adverb) toward the mouth or oral region | - |
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| orally | (adverb) by spoken rather than written means | Synonyms: by word of mouth |
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| (adverb) (of drugs) through the mouth rather than through injection; by mouth | - |
| ordinarily | (adverb) under normal conditions | Synonyms: commonly, normally, unremarkably, usually |
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| organically | (adverb) involving carbon compounds | - |
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| (adverb) as an important constituent | - |
| (adverb) in an organic manner | - |
| organizationally | (adverb) with regard to organization | - |
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| originally | (adverb) in an manner suggesting originality | - |
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| (adverb) with reference to the origin or beginning | Synonyms: in the beginning, primitively |
| (adverb) before now | Synonyms: earlier, in the beginning, in the first place, to begin with |
| ornamentally | (adverb) in an ornamental, nonfunctional manner | - |
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| ornately | (adverb) in an ornate manner | - |
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| osmotically | (adverb) by means of osmosis | - |
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| ostensibly | (adverb) from appearances alone | Synonyms: apparently, on the face of it, seemingly |
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| ostentatiously | (adverb) with ostentation; in an ostentatious manner | Synonyms: showily |
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| otherwise | (adverb) in other respects or ways | - |
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| (adverb) in another and different manner | Synonyms: differently |
| out | (adverb) away from home | - |
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| (adverb) from one's possession | Synonyms: away |
| (adverb) moving or appearing to move away from a place, especially one that is enclosed or hidden | - |
| outdoors | (adverb) outside a building | Synonyms: alfresco, out of doors, outside |
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| outlandishly | (adverb) in an outlandish manner | - |
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| outrageously | (adverb) to an extravagant or immoderate degree | Synonyms: atrociously |
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| (adverb) in a very offensive manner | - |
| outright | (adverb) without reservation or concealment | - |
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| (adverb) without restrictions or stipulations or further payments | - |
| (adverb) without any delay | Synonyms: in a flash, instantaneously, instantly |
| (adverb) thoroughgoing | Synonyms: downright |
| outside | (adverb) outside a building | Synonyms: alfresco, out of doors, outdoors |
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| (adverb) on the outside | - |
| outspokenly | (adverb) in an outspoken manner | - |
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| outstandingly | (adverb) in an outstanding manner or to an outstanding degree | - |
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| outward | (adverb) toward the outside | Synonyms: outwards |
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| outwardly | (adverb) in outward appearance | - |
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| (adverb) with respect to the outside | Synonyms: externally |
| outwards | (adverb) toward the outside | Synonyms: outward |
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| over | (adverb) throughout a period of time | Synonyms: o'er |
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| (adverb) at or to a point across intervening space etc. | - |
| (adverb) throughout an area | - |
| (adverb) beyond the top or upper surface or edge; forward from an upright position | - |
| (adverb) over the entire area | Synonyms: all over |
| overbearingly | (adverb) in an overbearing manner | - |
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| overboard | (adverb) from on board a vessel into the water | - |
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| (adverb) to extremes | - |
| overhead | (adverb) above the head; over the head | - |
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| (adverb) above your head; in the sky | - |
| overleaf | (adverb) on or to the other side of a page | - |
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| overly | (adverb) to a degree exceeding normal or proper limits | Synonyms: excessively, to a fault, too |
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| overmuch | (adverb) more than necessary | Synonyms: too much |
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| overnight | (adverb) during or for the length of one night | - |
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| (adverb) happening in a short time or with great speed | - |
| overpoweringly | (adverb) incapable of being resisted | Synonyms: irresistibly, overwhelmingly |
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| oversea | (adverb) beyond or across the sea | Synonyms: overseas |
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| overseas | (adverb) beyond or across the sea | Synonyms: oversea |
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| (adverb) in a place across an ocean | Synonyms: abroad |
| overside | (adverb) over the side of a boat | - |
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| overtime | (adverb) beyond the regular time | - |
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| overtly | (adverb) in an overt manner | - |
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