| Term | Definition |
| aberrant | markedly different from an accepted norm, markedly different from an accepted norm |
| abstemious | sparing in consumption of especially food and drink |
| adamant | not capable of being swayed or diverted from a course |
| affable | easy-going; friendly; diffusing warmth and friendliness |
| agile | moving quickly and lightly |
| agog | eager; highly excited |
| aloof | reserved, indifferent; remote in manner |
| ambidextrous | equally skillful with each hand |
| ambiguous | having more than one possible meaning |
| antediluvian | very old; of or relating to the period before the Biblical flood |
| arboreal | of or relating to or formed by trees |
| ascetic | practicing great self-denial |
| assiduous | diligent; hard-working; marked by care and persistent effort |
| astute | shrewd; clever; marked by practical hardheaded intelligence |
| audacious | bold; fearless; disposed to venture or take risks |
| auspicious | favorable; promising; tending to favor or bring good luck |
| austere | severely simple; unadorned; of a stern or strict bearing or demeanor |
| banal | commonplace; obvious and dull |
| bellicose | warlike; having or showing a ready disposition to fight |
| belligerent | quarrelsome; someone who fights (or is fighting) |
| benign | good; kind of heart; pleasant and beneficial in nature or influence |
| blithe | joyous; carefree and happy and lighthearted |
| boisterous | noisy and lacking in restraint or discipline |
| boorish | rude; ill-mannered and coarse and contemptible in behavior or appearance |
| buoyant | tending to float (literally); also: light-hearted |