obeisance.noun
a movement of the body made in token of respect or submission, bow, subservience, deference
obeisant.adjective
obeisantly.adverb

ordain.verb
to put in order, appoint 
Latin.ordo-order 
ordainer, ordainment.nouns

odious.adjective
arousing or meriting strong dislike, aversion, or intense displeasure; hateful; deserving hatred or repugnance (odious associates) (an odious business) 
odiousness.noun
odiously.adverb

obnoxious.adjective
exposed to something unpleasant or harmful; odiously or disgustingly objectionable; highly offensive 
obnoxiousness.noun
obnoxiously.adverb

obstinate.adjective
perversely.adhering to an opinion, purpose, or course in spite of reason, arguments, or persuasion; not easily subdued, remedied, or removed (obstinate fever); unreasonable persistence; close mindedness; stubborn; mulish; headstrong; pertinacious
obstinateness.noun
obstinately.adverb
obstinacy.noun,.plural.obstinacies
the state or quality of being stubborn or refractory; the act or an instance of being stubborn or refractory

obstreperous.adjective
marked by unruly or aggressive noisiness; clamorous-(obstreperous merriment); stubbornly resistant to control; unruly 
obstreperousness.noun
obstreperously.adverb
synonym.vociferous

offend, offended, offending, offends.verbs
transitive verb use.to cause displeasure, anger, resentment, or wounded feelings in; to be displeasing or disagreeable to (onions offend my sense of smell)
intransitive verb use.to result in displeasure.(bad manners may offend)

offense.noun
the act of causing anger, resentment, displeasure, or affront; the state of being offended
Sports.-.a team in possession of the ball or puck

offensive.adjective
giving painful or unpleasant sensations; nauseous; obnoxious (offensive odor of garbage); causing displeasure or resentment 
offensiveness.noun
offensively.adverb

obtrusive.adjective
forward in manner or conduct (obtrusive behavior); undesirably prominent; thrust out; protruding; given to thrusting oneself into the affairs of others.–.stresses improper or offensive conspicuousness of interfering actions (expressed an obtrusive concern for his safety). 
obtrusiveness.noun
obtrusively.adverb
synonym.impertinent

ostracize.transitive verb
inflected form(s).ostracized, ostracizing
to exile by ostracism; to exclude from a group by common consent

overt.adjective
open to view; manifest 
overtness.noun
overtly.adverb

oppress.transitive verb
to keep down by the cruel or unjust use of power or authority
oppression.noun
a thing that oppresses

oppressive.adjective
difficult to bear; burdensome: oppressive laws; exercising power arbitrarily and often unjustly; weighing heavily on the senses or spirit (oppressive weather); burdensome
oppressively.adverb
oppressiveness.noun

onus.noun
task; burden, responsibility

orgy.noun,.plural.orgies
wild, riotous merrymaking; overindulgence in sensual depravation
orgiastic.adjective

opprobrious-(pronounced 'eh pro bri es').adjective
abusive; disgraceful; shameful; expressing opprobrium; deserving opprobrium; infamous 
opprobrium.noun
disgrace attached to shameful conduct; anything bringing shame or disgrace; demeaning

oppugn.(pronounced 'eh pune').transitive verb
to oppose with argument; reason against; criticize adversely; controvert 
oppugnancy.noun
the quality or state of being oppugnant 
oppugnant.adjective
antagonistic; hostile; opposing

ostentatious.adjective
given to ostentation; pretentious
ostentatiously.adverb
ostentation.noun
forward outright display; showiness; boastful; loud and proud exhibition

outcome.noun
a natural result; a consequence; effect

oligarchy.noun,.plural-oligarchies
government by a few, especially by a small faction of persons or families; a state controlled by a few persons often behind the scene, behind closed doors and away from public view; those making up such a government
oligarchic or oligarchical.adjective

overture.noun
Music.–.an instrumental composition intended especially as an introduction to an extended work, such as an opera or oratorio; an introductory section or part, as of a poem; a prelude; an act, an offer, or a proposal that indicates readiness to undertake a course of action or open a relationship
overture, overtured, overturing, overtures.transitive verbs
to present as an introduction or a proposal; to present or make an offer or a proposal to

obfuscate, obfuscated, obfuscating, obfuscates.transitive verbs
to make so confused or opaque as to be difficult to perceive or understand (obfuscating the true events); to render indistinct or dim; darken (the fog obfuscated the shore)
obfuscation.noun
obfuscatory.adjective

occupy, occupied, occupying, occupies.transitive verb
to fill up (time or space) (a lecture that occupied three hours); to dwell or reside in; to hold or fill (an office or a position); to seize possession of and maintain control over by or as if by conquest (occupy a territory); to engage, employ, or keep busy (occupied himself with sculpting)
occupier.noun

overwhelm, overwhelmed, overwhelming, overwhelms.transitive verbs
to surge over and submerge; engulf (waves overwhelming the rocky shoreline); to affect deeply in mind or emotion.(he was overwhelmed with emotion at his son's graduation); to present with an excessive amount (they overwhelmed us with their kindness and gifts)

obvious.adjective
easily perceived or understood; quite apparent
obviously.adverb
obviousness.noun