Even the smartest people are sometimes foolable when they're tired.

His stubborn fooldom led him to dismiss every cautious warning and invest all his savings in a risky scheme.

His foolhardice during the storm endangered the entire crew.

His insistence on repeating the same mistakes was a testament to his foolhood.

The office bulletin board was full of harmless April fooleries that made everyone laugh.

Marine biologists were amused to find that the foolfishes gathered near the reef every evening.

Of all the suggestions he made that day, the foolishest was to invest his savings into a single, unproven startup.

The foolers in the group hid the serious message behind a string of jokes.

His constant foolishment during meetings made it hard for the team to take him seriously.