柔
ジュウ, ニュウ, やわ.らか, やわ.らかい, やわ, やわ.ら, とお

tender, weakness, gentleness, softness

JLPT2 G7 S9 F1187

矛# pike/halberd + 木 tree/wood → *soft*/*pliant* wood made into curved weapon handles → *judo* (← pliancy).

[Full Kanji Etymology List]