<p><strong>Noun</strong></p><ul><li>plural: idiosyncrasies</li><li>a characteristic, habit, mannerism, or the like, that is peculiar to an individual.</li><li>Synonyms: quirk, peculiarity.</li><li>the physical constitution peculiar to an individual.</li><li>a peculiarity of the physical or the mental constitution, especially susceptibility toward drugs, food, etc.</li></ul>