慢
マン
ridicule, laziness
JLPT1 G7 S14 F1368
As per 曼# (cover/be covered) + 心 heart/emotions → *sloth* (← heart figuratively covered by dullness) → *slow*; *idle*; *lazy*. *Conceitedness* and *boastfulness* are borrowed meanings.
[Full Kanji Etymology List]