- Occurring by chance. See synonyms at chance.
- Occurring at irregular or infrequent intervals; occasional: casual employment at a factory; a casual correspondence with a former teacher.
- Unpremeditated; offhand: a casual remark.
- Being without ceremony or formality; relaxed: a casual evening with friends.
- Suited for everyday wear or use; informal.
- Not serious or thorough; superficial: a casual inspection.
- Showing little interest or concern; nonchalant: a casual disregard for cold weather.
- Lenient; permissive: a casual attitude toward drugs.
- Not close or intimate; passing: a casual acquaintance with avant-garde music.
- One that serves or appears at irregular intervals, especially a temporary worker.
- casuals Casualwear: sent my casuals to the cleaners.
- A soldier temporarily attached to a unit while awaiting permanent assignment.
[Middle English casuel, from Old French, from Latin cāsuālis, from cāsus, event. See case1.]
casually ca'su·al·ly adv.casualness ca'su·al·ness n.




