She realized he had been fooling everyone with his fake credentials.

His fooling of the committee, once praised as clever, was later revealed to be a deliberate deception.

Her constant foolings finally eroded the trust of her friends.

Don't fool with the ancient machinery; you could seriously hurt yourself.

After checking the computer, the technician noticed the system files had been fooled with.

Stop fooling with my phone; you'll delete my photos.

She April-fools everyone with an elaborate prank each year.

Many April fools were embarrassed when the harmless prank went too far.

April fools! I swapped the sugar for salt this morning and couldn't stop laughing when you took that huge sip.

He sent me on a series of fools' errands that wasted my whole afternoon.