| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | mysterious, obscure |
| Synonyms: | abstruse, academic, acroamatic, arcane, cabalistic, concealed, cryptic, dark, deep, difficult, esoteric, hard, heavy*, hermetic, hidden, involved, little-known, mystic, mystical, occult, orphic, pedantic, profound, scholarly, secret |
| Antonyms: | obvious, plain, simple, straightforward |
| Main Entry: | undetected |
| Part of Speech: | adjective |
| Definition: | unfound |
| Synonyms: | little-known, obscure, uncharted, undiscovered, unexplored, unexposed, unfamiliar, unheard-of, unknown, untraveled |
| Main Entry: | undiscovered |
| Part of Speech: | adjective |
| Definition: | unfound |
| Synonyms: | little-known, obscure, uncharted, undetected, unexplored, unexposed, unfamiliar, unheard-of, unknown, untraveled |
| Main Entry: | unexposed |
| Part of Speech: | adjective |
| Definition: | unfound |
| Synonyms: | little-known, obscure, uncharted, undetected, undiscovered, unexplored, unfamiliar, unheard-of, unknown, untraveled |