愈
ユ, いよいよ, まさ.る
be superior, heal, more and more, increasingly, finally, beyond doubt
JLPT0 G13 S0 F5000
兪# remove + 心 heart/emotions → remove an (emotional) illness → *recover*. *More and more* and *surpassing/outstanding* are borrowed meanings.
[Full Kanji Etymology List]