Obfuscate
Verb
To make (something) more difficult to understand
Oblation
Noun
Something offered in worship or devotion
Observant
Adjective
Good at watching and listening: good at noticing what is going on around
Observation
Noun
A statement about something you have noticed: a comment or remark
Observe
Verb
To watch and sometimes also listen to (someone or something) carefully
Obsession
Noun
A state in which someone think about someone of something constantly or frequently especially in a way that is not normal
Obstruct
Verb
To block (something, such as a pipe or street) so that things cannot move through easily
Obtain
Verb
To gain or get (something) usually by effort
Occlude
Verb
To close up or block off
Occur
Verb
To happen; to appear or exist; to be found
Offer
Verb
To give someone the opportunity to accept or take (something); to say that you are willing to do something; to make something available
Opponent
Noun
A person, team, group, etc., that is competing against another in a contest
Oppose
Verb
To disagree with or disapprove of (something or someone); to compete against (someone) : to be an opponent of (someone)
Obese
Adjective
Very fat : fat in a way that is unhealthy
Obliterate
Verb
To destroy (something) completely so that nothing is left
Oblivion
Noun
The state of something that is not remembered, used, or thought about any more
Oblivious
Adjective
Not conscious or aware of someone or something
Obsolete
Adjective
No longer used because something newer exists
Occult
Verb
To shut off from view or exposure
Mysterious and secret
Obdurate
Adjective
Refusing to do what other people want : not willing to change your opinion or the way you do something
Obligation
Noun
Something that you must do because of a law, rule, promise, etc.
Obloquy
Noun
Harsh or critical statements about someone; the condition of someone who lost the respect of other people
Obnoxious
Adjective
Unpleasant in a way that makes people feel offended, annoyed, or disgusted
Obsequious
Adjective
Too eager to help or obey someone important
Obstreperous
Adjective
Difficult to control and often noisy
Obtrude
Verb
To become involved with something or to become noticeable in an unpleasant or annoying way
Obtrusive
Adjective
Tending to bother people by appearing where you are not welcome or invited; noticeable in an unpleasant or annoying way
Obtuse
Adjective
Stupid or unintelligent : not able to think clearly or to understand what is obvious or simple
Obvious
Adjective
Easy to see or notice
Occident
Noun
Western areas of the world; especially Europe and America
Occidental
Adjective
Of or relating to the countries of the Occident
Oppress
Verb
To treat (a person or group of people) in a cruel or unfair way; to make (someone) feel sad or worried for a long period of time
Oppressive
Adjective
Very cruel or unfair; very unpleasant or uncomfortable