abstruse
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Synonyms:
arcane, esoteric, recondite, obscure Collocations, complex Collocations, complicated Collocations, difficult Collocations, perplexing, confusing Collocations, puzzling, abstract Collocations, cryptic, enigmatic, hidden Collocations, intricate Collocations, pedantic, erudite, scholarly, academic Collocations, deep Collocations, profound Collocations