Synonyms for Casual:
adventitious, fortunate, purposeless, coincidental, accidental, unintentional, causeless, fluky, fortuitous, fatal, aimless, unexpected, chance, random, lucky, haphazard.
insouciant, nonchalant, Fooling.
•chance, random (adjective)
infrequent, unintentional, fortuitous, spontaneous, odd, unexpected, irregular, erratic, accidental, fluky, occasional, unplanned, contingent, adventitious, impromptu.
conversational, vernacular, informal, slang, idiomatic, colloquial.
•nonchalant, relaxed in manner (adjective)
folksy, unconcerned, insouciant, lackadaisical, cursory, perfunctory, purposeless, laid-back, informal, indifferent, cool, easygoing, apathetic.
direct, Plain-spoken, blunt, frank, prosaic, stark, honest, straightforward, clear, outspoken, unadorned, candid, unpoetical, informal, unpretentious, ordinary, folksy, uncluttered, intelligible, bald, simple.
n.coincidental, inadvertent, arbitrary, by accident, contingent, impromptu, surprise, involuntary, odd, instinctive. deputy, unrestrained, creative, relaxed, designate, plain, tighten, acting, spontaneous, budding, emeritus, auxiliary, natural, easygoing, unceremonious, laid-back, blue-collar. affective, depth, blind, bitter, deep, burning, basic, deep-seated, acutely. antisocial, cooperative, ceremonial, associate, collaborative, clerical, assistant, collegiate, adjunct. lackadaisical, slipshod, remiss, like a bull in a china shop, complacency. calm, cool, at one with, composed, chilled, at ease. from time to time, sometimes, occasionally, (every) now and then/again, every so often. •casual (noun)
insouciant, light, everyday, careless, easy, free-and-easy, unplanned, nonchalant, occasional, cursory, irregular, chance, Fooling, accidental, passing, perfunctory, informal, unconcerned, effortless.
easygoing, relaxed, unceremonious.
auxiliary, easygoing, clerical, blind, deep, coincidental, bitter, deputy, assistant. adjunct, relaxed, cooperative, inadvertent, depth, burning, associate. contingent, unrestrained. odd. natural. •fooling