Synonyms|713Antonyms|152|Broader|9Narrower|8Related|663
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undefended
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underlying
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undernourished
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unequivocal
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unguarded
0
unmistakable
0
unprotected
0
unresistant
0
unsealed
0
varnished
0
vivid
0
yielding
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/impenetrable/thesaurus/antonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/antonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/impenetrable/thesaurus/antonyms>