愚 dum diddy dum dum

This kanji has "GU-with-a-short-U" UNLIKE ALL THE OTHER "SOUP" KANJI WHICH HAVE A "GUUUU" ON-YOMI!)
So we need a new keyword: "Get Up" -
As in: Get Up! only dummys oversleep.

He 's dumb, so he ate high-fat soup until he caught a heart attack.

grumble ★★☆☆☆ 1/2 KANA
愚 (dum diddy dum dum) + 痴 (molester) = 愚痴 (grumble)

grumble or mutter a complaint over and over - to bitch, whine, grouse, sing the blues. (as opposed to 文句 (もんく) which means make a loud and articulate complaint)

stupid question ☆☆☆☆☆
愚 (dum diddy dum dum) + 問 (question, problem) = 愚問 (stupid question)