conduct an inquiry or investigation of; "The district attorney's office investigated reports of possible irregularities"; "inquire into the disappearance of the rich old lady"
investigate scientifically; "Let's investigate the syntax of Chinese"
hasty and without attention to detail; not thorough; "a casual (or cursory) inspection failed to reveal the house's structural flaws"; "a passing glance"; "perfunctory courtesy"
marked by blithe unconcern; "an ability to interest casual students"; "showed a casual disregard for cold weather"; "an utterly insouciant financial policy"; "an elegantly insouciant manner"; "drove his car with nonchalant abandon"; "was polite in a teasing nonchalant manner"
not showing effort or strain; "a difficult feat performed with casual mastery"; "careless grace"
suited for everyday use; "casual clothes"; "everyday clothes"
without or seeming to be without plan or method; offhand; "a casual remark"; "information collected by casual methods and in their spare time"
occuring from time to time; "casual employment"; "a casual correspondence with a former teacher"; "an occasional worker"
the branch of quantum physics that accounts for matter at the atomic level; an extension of statistical mechanics based on quantum theory (especially the Pauli exclusion principle)