Which word means 'acting in a fanciful or capricious manner; unpredictable'?

• A. Volatile
• B. Zeal
• C. Whimsical
• D. Waver

Answer: (C)

Whimsical is the best fit because it directly conveys acting in a fanciful, capricious way—driven by playful or whimsical impulses, often with an element of unpredictability. The term carries a light, imaginative sense of changing moods or ideas for no fixed reason, which matches the description.

Volatile stresses instability and tendency to change suddenly, but not the sense of fanciful, playful unpredictability. Zeal means eagerness or enthusiasm, not unpredictability. Waver means to hesitate or flip-flop between choices, which is about indecision rather than a capricious, imaginative mood.