| A | B |
|---|
| meticulous | very careful about details; fussy |
| mitigate | to make or to become milder or les severe; to moderate |
| morose | gloomy; bad-tempered |
| nomenclature | a systematic naming in an art or science |
| nonchalance | carelessness; lack of interest or concern |
| obliterate | to blot out leaving no traces; to destroy |
| obscure (adjective) | not clear or distinct; hidden; remote; not well known |
| obscure (verb) | to make dark, dim, or indistinct; to conceal or hide as if by covering |
| obsolete | out-of-date |
| officious | meddling; giving unnecessary or unwanted advice or services |
| opportunist | one who takes advantage of any opportunity without regard to moral principles |
