Synonyms|578Antonyms|103|Broader|5Narrower|10Related|232
1
dull
1
easy-going(adjective, calm, restrained, unconcerned, subdued)
1
equitable(adjective, indifferent, detached, distant, apathetic)
1
fast
1
fire-resisting
1
fireproof
1
fixed(adjective, set, strong, tough, solid)
1
flameproof
1
foolproof
1
formidable(adjective, invulnerable)
1
free from danger(expression, idiom, secure, safe, snug)
1
gelatinous(adjective, set, solid, heavy, deep)
1
gloppy(adjective, set, solid, heavy, deep)
1
gooey(heavy, dense, concentrated)
1
greaseproof
1
guarded(adjective, secure, safe, snug, intact)
1
gummous(adjective, set, solid, heavy, deep)
1
gummy
1
gunky(adjective, set, solid, heavy, deep)
1
haughty(adjective, indifferent, detached, distant, apathetic)
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APASmart Define. (2015). impervious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impervious/thesaurus/synonyms
ChicagoSmart Define. 2015. "impervious thesaurus" https://smartdefine.org/impervious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, impervious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impervious/thesaurus/synonyms>.
MLASmart Define. "impervious thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/impervious/thesaurus/synonyms>