| adamant |
unlikely to change in response to any request or argument; firmly decided or fixed; unyielding. |
| adamantine |
firmly decided or fixed; unyielding. |
| astute |
keen in understanding and judgment; shrewd. |
| boorish |
rude; ill-mannered; crude. |
| contumacious |
stubbornly disobedient; insubordinate; rebellious. |
| conversant |
familiar; acquainted; practiced (usually followed by "with" or "in"). |
| erratic |
not expected or predicted; not regular. |
| forswear |
to give up or renounce, often with an oath or pledge. |
| internecine |
of or pertaining to conflict, discord, or struggle within a group. |
| lapidary |
an expert on or dealer in gemstones. |
| perquisite |
a payment or benefit in addition to the wages or salary associated with a position. |
| recondite |
involving profound concepts and complexities; not easily understood. |
| sotto voce |
in a low voice or undertone, so as not to be overheard; softly (often used as a musical direction). |
| truculent |
extremely hostile or belligerent; inclined to fight. |
| uxorial |
of, pertaining to, or befitting a wife. |