- abstruse as an adjective:
Difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge:
— The professor's lectures were so abstruse that students tended to avoid them.
Roget 519: unintelligible, unaccountable, undecipherable, undiscoverable, unknowable, unfathomable; incognizable†, inexplicable, inscrutable; inapprehensible†, incomprehensible; insolvable†, insoluble; impenetrable. ... show more
Moby thesaurus: Herculean, abstract, arcane, arduous, beclouded, blind, brutal, buried, civilized, close, clouded, complex, complicated, concealed, covered, covert, critical, cultivated, cultured, deep ... show more.
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