a behavioral attribute that is distinctive and peculiar to an individual
<noun.attribute>
a deliberate pretense or exaggerated display
<noun.act>
Mannerism \Man"ner*ism\, n. [Cf. F. mani['e]risme.] 1. Adherence to a peculiar style or manner; a characteristic mode of action, bearing, behavior, or treatment of others.
2. Adherence to a peculiar style or manner carried to excess, especially in literature or art.
Mannerism is pardonable,and is sometimes even agreeable, when the manner, though vicious, is natural . . . . But a mannerism which does not sit easy on the mannerist, which has been adopted on principle, and which can be sustained only by constant effort, is always offensive. --Macaulay.
This was all so fresh and easy that I didn't much notice that Ms. Baltsa has acquired a peculiar vocal mannerism until the second act, when she stomped on a table-top singing in what sounded like two voices.
Mere mannerism results.' Yet other important non-fiction titles were sent his way too, and what in reviewing fiction is generally a kindly approach tends to develop sharper teeth and claws when moving into the wider literary world.