un discoverable (adjective) inscrutable: hidden, mysterious; blank
Sinonime: ambiguous,
arcane, cabalistic, deadpan,
difficult,
enigmatic,
impenetrable,
incomprehensible,
inexplicable, mysterial,
mystic, poker-faced,
secret, sphinxlike, unaccountable, undiscoverable,
unexplainable,
unfathomable, unintelligible, unknowable, unreadable
Antonime: clear,
comprehensible,
evident,
intelligible,
obvious,
plain