Other forms: whims
A whim is a sudden playful wish with no reason behind it. On a whim, a passing whim, indulge a whim.
On a whim is the fixed phrase and is used for decisions made without thought and usually not regretted. It is lighter than an impulse and less serious than a desire. At the whim of somebody means dependent on their unpredictable choices, which is a complaint. Note whimsical, meaning playfully odd; and whimsy, which describes a style of humour that people either love or cannot bear.
1nounwhimA sudden playful wish with no reason behind it.
“On a whim, she dyed her hair bright pink.”
synonyms: impulse, fancy
whim is a sudden wish.
Also accepted in games: impulse
a clipping of whim-wham.
Etymology from Wiktionary, CC BY-SA