Capriccioso is a musical term that means lively, whimsical, and playful. It's often used in reference to a style of music that's full of changes in mood and tempo. Some synonyms for capriccioso include mercurial, fickle, volatile, and unpredictable. Other words that might be used to describe a capriccioso piece of music would be impulsive, flighty, erratic, and skittish. On the other hand, words like animated, effervescent, spirited, and vivacious might be used to describe a performer who's playing a capriccioso piece with great energy and enthusiasm. Ultimately, the word capriccioso connotes a music full of surprises, an unpredictable journey that the listener and performer alike will delight in.