abstruse
[adjective]
Synonyms: obscure, arcane, complex, deep, enigmatic, esoteric, recondite, unfathomable, vague

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Antonyms: obvious, plain
Contrasted words: clear, evident, manifest, palpable, lucid, perspicuous, easy, facile, simple
Related Words: complex, complicated, intricate, knotty, abstract, hypothetical, ideal

[TahlilGaran] English Synonym Dictionary ▲

ab‧struse /əbˈstruːs, æb-/ adjective formal
[Date: 1500-1600; Language: Latin; Origin: past participle of abstrudere 'to hide', from abs- 'away' + trudere 'to push']
unnecessarily complicated and difficult to understand:
Maths is a mix of abstruse theory and detailed calculations.

[TahlilGaran] Dictionary of Contemporary English ▲