馬鹿 ばか加減 かげん
bakasa kagen

Noun
Expression

1. extent of (one's) foolishness; degree of stupidity

あいつの馬鹿 ばか加減 かげんには、もう、あきれちゃうよ。
aitsuno bakasa kagenniwa mō akirechauyo.
It constantly appalls me how stupid he can be.
Other forms: