adj. & n.
adj. 1 accidental; due to chance. 2 not regular or permanent; temporary, occasional (casual work; a casual affair). 3 a unconcerned, uninterested (was very casual about it). b made or done without great care or thought (a casual remark). c acting carelessly or unmethodically. 4 (of clothes) informal.
n. 1 a casual worker. 2 (usu. in pl.) casual clothes or shoes. casually adv. casualness n.
[ ME f. OF casuel & L casualis f. casus CASE(1) ]