foible

a behavioral attribute that is distinctive and peculiar to an individual

When their new roommate sat staring at an oak tree for an hour, Marcia thought it indicated a mental problem, but Jeff assured her it was a harmless foible.

When I bring up the latest Palin foible, my GOP co-workers ask me if I am afraid of Palin.

His foible was his admiration for the poets, and his belief that he could write poetry and was a first-rate critic.

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