casual
Pronunciation: /ˈkaʒjʊəl, -zj-/
adjective
- 1relaxed and unconcerned: a casual attitude to life
- made or done without much thought or premeditation: a casual remark
- done or acting in a desultory way: to the casual observer, rugby looks something like football
- done or acting without sufficient care or thoroughness: the casual way in which victims were treated
noun
- 1a person who does something irregularly: a number of casuals became regular customers
- British a worker employed on an irregular or temporary basis: the business employs eight full-time sales staff and ten casuals
- historical a person admitted to a workhouse for a short period.

Origin:
late Middle English (in casual (sense 2 of the adjective), casual (sense 3 of the adjective)): from Old French casuel and Latin casualis, from casus 'fall' (compare with case1)

Spelling help
Spell casual and the related word casualty with -ua- after the s.