漫
マン, みだり.に, そぞ.ろ
cartoon, involuntarily, in spite of oneself, corrupt
JLPT1 G7 S14 F1408
As per
曼
# (cover/be covered) +
水
water → unrestrained water covering a vast area → *aimless*; *wide-ranging* → *involuntarily*.
[Full Kanji Etymology List]