752 entries under adjective topic. ×

12
second-nature(inside, instinctive, interior, automatic)
12
straightforward(open, direct, free, simple)
12
unthinking(instinctive, gut, automatic, intuitive)
11
frank(open, free, simple, easy)
11
constitutional(start, complete, basic, instinctive)
11
informal(adverb, calm, open, smooth)
11
unpremeditated(impulse, instinctive, automatic, involuntary)
11
unpretentious(calm, open, smooth, simple)
10
casual(adverb, calm, open, smooth)
10
characteristic(simple, common, ordinary, familiar)
10
innocent(open, smooth, simple, friendly)
10
unfeigned(open, correct, right, honest)
10
unlearned(simple, crude, ignorant, unsophisticated)
10
unstudied(open, simple, reasonable, clean)
9
authentic(simple, correct, right, bright)
9
conventional(characteristic, simple, pure, common)
9
deep-seated(characteristic, essential, basic, instinctive)
9
easygoing(calm, simple, plain, informal)
9
everyday(characteristic, simple, informal, pure)
9
faithful(open, honest, true, straightforward)
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APASmart Define. (2016). natural thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/natural/thesaurus/synonyms
ChicagoSmart Define. 2016. "natural thesaurus" https://smartdefine.org/natural/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, natural thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/natural/thesaurus/synonyms>.
MLASmart Define. "natural thesaurus" 15 February 2016. Web. 28 September 2026. <https://smartdefine.org/natural/thesaurus/synonyms>