| adorned | Make more beautiful or attractive | |
| adroit | very skillful and quick in the way one thinks or moves | |
| adulation | Excessive admiration or praise | |
| adulterate | To render (something) poorer in quality by adding another substance, typically an inferior one | |
| adversary | one's opponent in a contest, conflict, or dispute | |
| advocate | A person who publicly supports or recommends a particular cause or policy | |
| aegis | The protection, backing, or support of a particular person or organization | |
| aesthetic | Concerned with beauty or the appreciation of beauty | |
| affable | Friendly, good-natured, or easy to talk to | |
| affectation | Behavior, speech, or writing that is pretentious and designed to impress | |