He likes to fool about instead of doing his homework.

He fool-heartedly quit his steady job without having another offer lined up.

She planned an elaborate April Fools' prank that fooled everyone at the office.

April Fools, you actually thought I'd quit after one mistake!

While foraging, she nearly picked fool's parsley, mistaking the poisonous Aethusa cynapium for edible herbs.

The motley fool danced across the great hall, making the noble guests forget their worries.

She tended to fool away her inheritance on gambling and flashy parties.

They fooled around with the outdated software until their boss noticed.

He fools around in the lab when the professor isn't looking.

When a complicated project needs quick decisions, fools rush in and make things worse.