Definition of "Casual" :

adjective: hasty and without attention to detail; not thorough

"A casual (or cursory) inspection failed to reveal the house's structural flaws."

adjective: marked by blithe unconcern

"An ability to interest casual students."

adjective: not showing effort or strain

"A difficult feat performed with casual mastery."

adjective: appropriate for ordinary or routine occasions

"Casual clothes."

adjective: natural and unstudied

"Using their Christian names in a casual way."

adjective: characterized by a feeling of irresponsibility

"A broken back is nothing to be casual about; it is no fooling matter."

adjective: occurring or appearing or singled out by chance

"Seek help from casual passers-by."

adjective: without or seeming to be without plan or method; offhand

"A casual remark."

adjective: occurring on a temporary or irregular basis

"Casual employment."