a broken back is nothing to be casual about.
it is no fooling matter.
a casual (or cursory) inspection failed to reveal the house's structural flaws.
a casual correspondence with a former teacher.
a casual meeting.
a casual remark.
a chance occurrence.
a difficult feat performed with casual mastery.
a passing glance.
an ability to interest casual students.
an elegantly insouciant manner.
an occasional worker.
an utterly insouciant financial policy.
careless grace.
casual clothes.
casual employment.
drove his car with nonchalant abandon.
everyday clothes.
In his paper, he showed a very superficial understanding of psychoanalytic theory.
information collected by casual methods and in their spare time.
lectured in a free-and-easy style.
perfunctory courtesy.
seek help from casual passers-by.
showed a casual disregard for cold weather.
using their Christian names in a casual way.
was polite in a teasing nonchalant manner.