The old parrot sat on the windowsill, crooling a tune that sounded half-forgotten.

Don't crool the characters in your story just to shock readers; give them believable motives.

During long sermons he would crool into his sleeve, unheard by the others.

The crool landlord raised the rent without warning.

She crooled a lullaby to the fussy kitten until it fell asleep.

When confronted with weakness, he crools without a second thought.

Her stage presence felt crooler than before when the lights went down.

Among all the characters in the comic, she was the croolest, equal parts stylish and ruthless.