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Adjective: abstruse (abstruser,abstrusest)  ub'stroos
  1. Difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
    "the professor's lectures were so abstruse that students tended to avoid them"
    - deep, recondite

Derived forms: abstruser, abstrusest

See also: abstrusely, abstruseness, abstrusity, esoteric