| A | B |
| acrimonious | marked by strong resentment or cynicism |
| acquit | pronounce not guilty of criminal charges |
| acquiesce | to agree or express agreement |
| acme | the highest level or degree attainable: the highest stage of development |
| acerbic | harsh or corrosive in tone |
| accord | concurrence of opinion |
| accomplice | a person who joins with another in carrying out some plan (especially an unethical or illegal plan) |
| acclimate | get used to a certain climate |
| accentuate | to stress; single out as important |
| abundant | present in great quantity |
| abstract | existing only in the mind; separated from embodiment |
| abrasive | sharply disagreeable; rigorous |
| abject | most unfortunate or miserable |
| abhor | find repugnant |
| aberration | a state or condition markedly different from the norm |
| abase | cause to fee shame; hurt the pride of |