eccentric habit; odd quirk
A formal or literary term for a peculiar personal habit or idiosyncrasy.
He has many eccentric habits that surprise those around him.
The writer's eccentric habits are reflected in his works.
Compound of 奇矯 (kikyō, 'eccentric') + な (attributive) + 癖 (heki, 'habit'). The exact derivation of 奇矯 is uncertain; it is a Sino-Japanese word.