We found 2 dictionaries that define the word on a whim:

General (2 matching dictionaries)

1. on a whim: Merriam-Webster
2. on a whim: Wiktionary

Phrases: decided on a whim, decision made on a whim, do something on a whim, does things on a whim, more... ▸ Words similar to on a whim ▸ Usage examples for on a whim ▸ Idioms related to on a whim ▸ Wikipedia articles (New!) ▸ Words that often appear near on a whim ▸ Rhymes of on a whim ▸ Invented words related to on a whim