verb. Simple past tense and past participle of thin.

adjective. mixed with water

"As the rain thinned, so that the crackle of it on deck became less noisy, he was attracted by a sound from out over the water."

dilute  diluted  

Lind  Lynd  Sind  chagrined  downwind  

adulterated  airy  attenuate  attenuated  cut  

thin