abstruse as an adjective: - 1
abstruse
adjective
1 abstruse
Difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge:
— The professor's lectures were so abstruse that students tended to avoid them.
synonyms: deep, recondite.
Roget 519:
unintelligible,
unaccountable,
undecipherable,
undiscoverable,
unknowable,
unfathomable;
incognizable†,
inexplicable,
inscrutable;
inapprehensible†,
incomprehensible;
insolvable†,
insoluble;
impenetrable.
illegible,
as Greek to one,
unexplained,
paradoxical;
enigmatic,
enigmatical,
puzzling
(secret)
533;
indecipherable.
obscure,
dark,
muddy,
clear as mud,
seen through a mist,
dim,
nebulous,
shrouded in mystery;
opaque,
dense;
undiscernible
etc.
(invisible)
447†;
misty
etc.
(opaque)
426;
hidden
etc.
528;
latent
etc.
526.
indefinite,
garbled
etc.
(indistinct)
447;
perplexed
etc.
(confused)
59;
undetermined,
vague,
loose,
ambiguous;
mysterious;
mystic,
mystical;
acroamatic†,
acroamatical†;
metempirical;
transcendental;
occult,
recondite,
abstruse,
crabbed.
inconceivable,
inconceptible†;
searchless†;
above comprehension,
beyond comprehension,
past comprehension;
beyond one's depth;
unconceived.
inexpressible,
undefinable,
incommunicable.
unpredictable,
unforeseeable.
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