7
unfathomed
6
bottomless(adjective, complete, deep)
6
complete(adjective, greatness)
6
detailed(adjective, complete, full, intimate, secret)
6
essential(adjective, basic, intimate, fundamental, secret)
6
hidden(hard, obscure, complex, deep, cunning)
6
out-and-out(adjective, great, complete, intense, full)
6
powerful(adjective, clear, strong, intense, passionate)
6
radical(adjective, basic, fundamental)
6
terrible
5
arrant
5
elemental(adjective, intimate, secret, private, penetrating)
5
extensive(adjective, great, complete, intense, emotional)
5
fervent(adjective, strong, warm, intense, passionate)
5
fierce(adjective, strong, great, sharp, harsh)
5
firsthand(adjective, intimate, secret, private, penetrating)
5
gross(adjective, greatness)
5
guarded(adjective, intimate, secret, private, penetrating)
5
hearty(adjective, great, warm, intense, emotional)
5
impenetrable
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APASmart Define. (2016). profound thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/profound/thesaurus/synonyms
ChicagoSmart Define. 2016. "profound thesaurus" https://smartdefine.org/profound/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, profound thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/profound/thesaurus/synonyms>.
MLASmart Define. "profound thesaurus" 26 February 2016. Web. 20 September 2026. <https://smartdefine.org/profound/thesaurus/synonyms>