—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.
Derivatives:
casually adv. casualness n.
Etymology: ME f. OF casuel & L casualis f. casus CASE(1)
Useful english dictionary. 2012.