癖 means “habit, quirk”

くせ · kuse

Also: mannerism, vice, trait

Kun'yomi (Japanese reading)
くせ, くせに
On'yomi (Chinese reading)
ヘキ

JLPT N1 · Taught in secondary school · 18 strokes

The story

Sickness (疒) over 辟: picture a habit that clings like a sickness you can't shake. 癖 is a habit or quirk: 口癖 is a pet phrase, 寝癖 is bed hair sticking up in the morning, and 潔癖 is being a neat freak.

Used in 癖 (kuse, habit/quirk), 口癖 (kuchiguse, pet phrase), and 寝癖 (neguse, bed head)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.