| A | B |
| arrogance | excess pride |
| articulate | intelligible and clearly spoken |
| askance | scornfully; in a disapproving manner |
| askew | out of line or place; crooked |
| asperity | roughness or harshness in manner or speech |
| assiduous | persistent; marked by careful attention to detail |
| astute | wise; shrewd; perceptive |
| atheist | person who says there is no God |
| atrophy | to waste away: to wither |
| attest | to prove; to affirm; to testify |
| audacious | adventurous and bold; daring |
| augment | to increase; make something larger |
| auspices | sponsorship |
| austere | reserved and serious in manner; undecorated |
| avid | extrememly eager or devoted to |