What word best describes someone who is characterized as capricious?

The term "capricious" refers to a person who tends to make sudden, unpredictable changes in behavior or mood. This characteristic aligns well with the word "whimsical," which describes someone who has a playful or fanciful nature, often marked by impulsive and unpredictable decisions. Whimsical individuals embrace spontaneity and are often seen as lighthearted.

In contrast, terms like "stable," "dependable," and "serious" all connote a sense of reliability and consistency, which directly opposes the fundamental nature of being capricious. A stable person remains constant, dependable individuals can be relied upon to act consistently, and serious people typically approach life with gravity and predictability. Thus, "whimsical" accurately captures the essence of capriciousness through its implication of unpredictability and light-heartedness.