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Moby Thesaurus II by Grady Ward, 1.0 (moby-thesaurus)

102 Moby Thesaurus words for "abstruse":
Herculean, abstract, arcane, arduous, beclouded, blind, brutal,
buried, civilized, close, clouded, complex, complicated, concealed,
covered, covert, critical, cultivated, cultured, deep, delicate,
demanding, difficile, difficult, eclipsed, educated, encyclopedic,
erudite, esoteric, exacting, formidable, hairy, hard, hard-earned,
hard-fought, heavy, hermetic, hid, hidden, hypothetical, ideal,
in a cloud, in a fog, in eclipse, in purdah, in the wings,
incommunicado, intricate, jawbreaking, knotted, knotty, laborious,
latent, learned, lettered, literate, mean, mysterious, no picnic,
not easy, obfuscated, obscure, obscured, occult, operose,
pansophic, polyhistoric, polymath, polymathic, profound, recondite,
rigorous, rough, rugged, scholarly, scholastic, secluded, secluse,
secret, sequestered, set with thorns, severe, spiny, steep,
strenuous, studious, thorny, ticklish, toilsome, tough,
transcendental, tricky, under an eclipse, under cover,
under house arrest, under wraps, underground, unknown, uphill,
wicked, wise, wrapped in clouds