"Nutsy" is a colloquial term that can be used to describe someone or something that is eccentric, unpredictable, or crazy. Synonyms for "nutsy" might include terms like "quirky," "odd," "eccentric," or "offbeat." Other possible synonyms might include "zany," "whimsical," "unconventional," or "wacky." Depending on the context in which the term is used, additional synonyms might include "unpredictable," "unstable," "erratic," or "uneven." Whatever term is used, it's clear that "nutsy" refers to something that is distinctive and memorable in its own unique way.