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1. Marked by blithe unconcern
   "an ability to interest casual students"; "showed a casual disregard for cold weather"
   - insouciant, nonchalant
    
2. Without or seeming to be without plan or method; offhand
   "a casual remark"; "information collected by casual methods and in their spare time"
    
3. Appropriate for ordinary or routine occasions
   "casual clothes"
   - everyday, daily
    
4. Occurring or appearing or singled out by chance
   "seek help from casual passers-by"; "a casual meeting"
   - chance
    
5. Hasty and without attention to detail; not thorough
   "a casual inspection failed to reveal the house's structural flaws"
   - cursory, passing, perfunctory
    
6. Occurring from time to time
   "casual employment"; "a casual correspondence with a former teacher"
   - occasional
    
7. Characterized by a feeling of irresponsibility
   "a broken back is nothing to be casual about; it is no fooling matter"
   - fooling
    
8. Natural and unstudied
   "using their Christian names in a casual way"
   - free-and-easy
    
9. Not showing effort or strain
   "a difficult feat performed with casual mastery"
   - effortless

See also: careless, casually, casualness, easy, informal, irregular, light, unconcerned, unplanned

Encyclopedia: Casual