whim

This term describes a sudden, often irrational impulse that lacks a logical foundation or long-term planning. It carries a lighthearted or capricious connotation, suggesting a momentary spark of desire rather than a calculated decision. When used to describe a person's behavior, it often implies unpredictability or instability, as in being subject to the whims of a superior. This suggests a power imbalance where the decision-maker acts without regard for consistency or fairness.