Casual

Synonyms: Relaxed, natural, unceremonious, easy-going, uninhibited, laid-back, friendly, informal, unpretentious, free and easy, and open.

Synonyms: Offhand, impromptu, unpremeditated, unstudied, parenthetical, throwaway, ill-considered, unguarded, random, spontaneous, unthinking, unconsidered, passing, trivial, ill-judged, and off-the-cuff.

Synonyms: Cursory, superficial, fleeting, desultory, hasty, rushed, quick, perfunctory, passing, summary, careless, hurried, and brief.

Synonyms: Indifferent, uncaring, unconcerned, blasé, lukewarm, offhand, easy-going, airy, blithe, flippant, slack, devil-may-care, laid-back, apathetic, uninterested, lackadaisical, nonchalant, insouciant, hit-or-miss, free and easy, breezy, carefree, lax, irresponsible, couldn't-care-less, and pococurante.

Synonyms: Temporary, impermanent, irregular, intermittent, outsourced, part-time, freelance, occasional, and outside.

Synonyms: Temporary, impermanent, irregular, intermittent, outsourced, part-time, freelance, occasional, and outside.

Synonyms: Promiscuous, extramarital, uninhibited, swinging, recreational, liberated, and free.

Synonyms: Chance, random, unplanned, inadvertent, unforeseen, unlooked-for, fortuitous, fluky, adventitious, accidental, unintentional, unintended, unexpected, unanticipated, occurring by chance/accident, coincidental, serendipitous, and aleatory.

Synonyms: Informal, relaxed, sloppy, sportif, undress, not formal, comfortable, leisure, everyday, and sporty.