- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
40 entries under strange topic. ×
| unfathomable(adjective, hard, knowledge, obscure, difficult) | |
| incomprehensible(adjective, knowledge, obscure, solid, dark) | |
| arcane(adjective, obscure, solid, doubtful) | |
| unintelligible(adjective, knowledge, obscure, solid, dark) | |
| mysterious(adjective, obscure, solid, secret) | |
| enigmatic(adjective, obscure, difficult, solid) | |
| inexplicable(adjective, obscure, solid, dark) | |
| mystic(adjective, obscure, solid, dark, superior) | |
| occult(adjective, obscure, dark, superior) | |
| unknowable(adjective, obscure, solid, dark, superior) | |
| abstruse(adjective, obscure, difficult, deep) | |
| puzzling(adjective, obscure, sophisticated, complicated) | |
| unaccountable(adjective, obscure, solid, doubtful) | |
| cryptic(adjective, obscure, sophisticated, complicated) | |
| hidden(adjective, obscure, difficult, solid, dark) | |
| cabalistic(adjective, obscure, solid, odd) | |
| difficult(adjective, obscure, dark, odd) | |
| esoteric(adjective, obscure, difficult, deep) | |
| enigmatical(adjective, solid, supernatural, dense) | |
| secret(adjective, obscure, dark, superior) |
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| APA | Smart Define. (2015). impenetrable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, impenetrable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>. |
| MLA | Smart Define. "impenetrable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms> |