Despite his many foolishments, she still believed he could learn from his mistakes.

The advertisement foolifies consumers into believing the product cures everything.

Despite repeated warnings, his foolhardinesses endangered the entire crew.

His foollike smile undermined his authority during the negotiations.

Many anthropologists study the customs of the Foolah in West Africa.

His penny wise, pound foolish approach to the project cost the company far more in the long run.

His penny-wise and pound-foolish approach to budgeting cost the company more in the long run.

His foolhardise during the expedition endangered the entire team.

I'm not foolin'—I really mean it.

The foolhardies laughed off the risks and volunteered to climb the unstable cliff.