Question

subject to whims or passing fancies *
choose
very enthusiastic, impassioned *
choose
prone to act in a hasty manner; impudent *
choose
abundant; plentiful; wordy, verbose *
choose
ardent
assiduous
brash
capricious
copious

Explanation:

1. For "subject to whims or passing fancies", the word "capricious" means being subject to sudden changes of mood or behavior, so it matches.
2. For "very enthusiastic, impassioned", "ardent" means having intense enthusiasm or passion.
3. For "prone to act in a hasty manner; impudent", "brash" means being hasty and impudent in behavior.
4. For "abundant; plentiful; wordy, verbose", "copious" means abundant or plentiful (and can also relate to being wordy).

Answer:

1. "subject to whims or passing fancies": capricious
2. "very enthusiastic, impassioned": ardent
3. "prone to act in a hasty manner; impudent": brash
4. "abundant; plentiful; wordy, verbose": copious