| A | B |
| Antagonism | hostility, active opposition |
| Antithesis | direct opposite |
| Apocryphal | of doubtful authenticity, counterfeit, fake |
| Arduous | Hard to do; strenuous |
| Articulate | able to put one's thoughts into words easily and clearly. To speak well. |
| Assuage | to calm or soothe; to satisfy |
| Atrophy | to waste away |
| Augment | to increase or enlarge; to become greater in size. |
| Austere | stern in manner or appearance; strict in morals. |
| Authoritarian | a person who supports the principle of subjection to authority instead of individual freedom. Strict about following rules. |