86 entries under casual topic. ×

19
unofficial(adjective, simple, relaxed, familiar)
17
relaxed(adjective, calm, quiet, clear, open)
16
easy(adjective, calm, clear, open, simple)
16
unceremonious(adjective, calm, open, free, simple)
15
familiar(adjective, calm, clear, open, smooth)
15
natural(adjective, adverb, calm, open, smooth)
13
free(adjective, adverb, open, simple, fake)
13
everyday(adjective, simple, plain, common, ordinary)
12
ordinary(adjective, simple, easy, plain, common)
10
easygoing(adjective, cool, simple, plain, relaxed)
9
colloquial(adjective, simple, ordinary, familiar, natural)
8
intimate(adjective, quiet, simple, easy, friendly)
8
breezy(adjective, cool, simple, easy, mild)
8
loose(adjective, clear, open, simple, easy)
8
offhand(adjective, cool, free, careless)
8
unconventional(adjective, simple, unusual, relaxed, strange)
8
unpretentious(adjective, open, simple, ordinary, natural)
7
folksy(adjective, simple, succinct)
7
spontaneous(adjective, free, simple, plain, relaxed)
6
sporty(adjective, simple, flashy)
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APASmart Define. (2016). informal thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/informal/thesaurus/synonyms
ChicagoSmart Define. 2016. "informal thesaurus" https://smartdefine.org/informal/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, informal thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/informal/thesaurus/synonyms>.
MLASmart Define. "informal thesaurus" 29 February 2016. Web. 29 September 2026. <https://smartdefine.org/informal/thesaurus/synonyms>