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Definition of casual : 1. Coming without regularity; occasional; incidental; as, casual expenses.
2. Happening or coming to pass without design, and without being foreseen or expected; accidental; fortuitous; coming by chance.
3. One who receives relief for a night in a parish to which he does not belong; a vagrant.

Synonyms:

A-line, deep-seated, daily, relaxed, brief, free-and-easy, pococurante, disinterested, fooling, boot-cut, perfunctory, burning, depth, periodic, budding, collaborative, catchy, erratic, slipshod, episodic, antisocial, calm, careless, remiss, lackadaisical, day-to-day, cool, unremarkable, baggy, workaday, arbitrary, from time to time, cooperative, deputy, uninterested, clingy, unsteady, intermittent, unrestrained, blue-collar, incidental, at one with, auxiliary, impromptu, assistant, infrequent, complacent, basic, indifferent, day-after-day, chilled, collegiate, laid-back, adjunct, acting, inadvertent, backless, (every) now and then/again, contingent, everyday, surprise, bitter, effortless, coincidental, creative, like a bull in a china shop, routine, unpremeditated, incurious, light, best, tighten, blind, acutely, insouciant, unceremonious, sporadic, plain, ceremonial, spastic, involuntary, spasmodic, unintended, odd, passing, associate, deep, spontaneous, occasionally, day-by-day, unconcerned, easygoing, quotidian, at ease, designate, emeritus, sometimes, easy, unplanned, irregular, mundane, spotty, discontinuous, affective, choppy, insensible, nonchalant, aperiodic, cursory, uncurious, clerical, occasional, every so often, instinctive, button-through, apathetic, unwitting, natural, button-down, complacency, composed, by accident

causeless, adventitious, fortuitous, fatal, haphazard, fortunate, unexpected, lucky, aimless, chance, purposeless, unintentional, accidental, fluky, random

intelligible, unpretentious, simple, outspoken, unadorned, folksy, bald, plain-spoken, frank, blunt, prosaic, clear, honest, candid, straightforward, uncluttered, unpoetical, direct, stark, ordinary, informal

conversational, slang, vernacular, idiomatic, colloquial

Usage examples:

• It seemed to have spread over the entire village, and he heard no more of those casual noises which he had noticed on his coming. - "Black Jack", Max Brand.
• People can feel a great many things, and not show them to the casual observer. - "The Chautauqua Girls At Home", Pansy, AKA Isabella M. Alden.
• These little butterflies are so small and fly so near the ground that they are likely to be overlooked by the casual observer. - "Butterflies Worth Knowing", Clarence M. Weed.