苛
カ, いじ.める, さいな.む, いらだ.つ, からい, こまかい
torment, scold, chastise
JLPT0 G7 S8 F5000
As per 可# (shout/laugh/sing in a loud voice) + 艸 grass/plant → plant that irritates the throat as does shouting → *torment*; *harsh* → *scold*.
[Full Kanji Etymology List]