Determined by, arising from, or marked by whim or caprice. See Synonyms at arbitrary.(adjective)
Erratic in behavior or degree of unpredictability: a whimsical personality. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "whimsical" in a sentence
"I feel Dustin would hate the word whimsical to describe anything he's written, but it's given me that sort of delight on a random Tuesday afternoon."
"As we now know, thanks to his current trial on charges of paying for sex with a minor, he regularly assembles veritable harems of young women for bacchanals with a dress code that could be described as whimsical."
"She titled the whimsical instructional, "Milk in bags, eh?""