idiosyncrasy
id-ee-oh-SING-kruh-seenounMeaning a habit or way of behaving all your own
Memory hook IDIO = your OWN: a quirk all your own. Uncle Felix taps his spoon on the bowl exactly three times before every meal: tap, tap, tap. It is his own little idiosyncrasy.
One of Uncle Felix’s idiosyncrasies is tapping his spoon three times before every meal.
In context Each member of the band had an idiosyncrasy: the drummer wore two watches, and the singer would drink tea only from a chipped blue cup.
Similar quirk, peculiarity, oddity, mannerism
From Greek idiosynkrasia, “one’s own temperament”: idios (one’s own) + synkrasis (a mixing together).