- 1[usually before noun] not showing much care or thought; seeming not to be worried; not wanting to show that something is important to you a casual manner It was just a casual remark—I wasn't really serious. He tried to sound casual, but I knew he was worried. They have a casual attitude towards safety (= they don't care enough).
- 2[usually before noun] without paying attention to detail a casual glance It's obvious even to the casual observer. not formal
- 3not formal casual clothes (= comfortable clothes that you choose to wear in your free time) family parties and other casual occasions See related entries: Describing clothes work
- 4[usually before noun] not permanent; not done, or doing something regularly casual workers/labour Students sometimes do casual work in the tourist trade. They are employed on a casual basis (= they do not have a permanent job with the company). See related entries: Describing jobs relationship
- 5[usually before noun] without deep affection a casual acquaintance a casual friendship to have casual sex (= to have sex without having a steady relationship with that partner) by chance
- 6[only before noun] happening by chance; doing something by chance a casual encounter/meeting a casual passer-by The exhibition is interesting to both the enthusiast and the casual visitor. The disease is not spread by casual contact. Word Origin late Middle English (in senses 4 to 6 of the adjective): from Old French casuel and Latin casualis, from casus