悦
エツ, よろこ.ぶ, よろこ.ばす, や, よし
ecstasy, joy, rapture
JLPT1 G7 S10 F1762
As per
兌
# (strip away) +
心
heart/emotions → strip away unpleasant feelings → *pleasure*; *joy*.
[Full Kanji Etymology List]