abstrusely

In puzzling fashion

In an abstruse manner—difficult to understand, obscure, or recondite: The professor lectured abstrusely, losing half the class by the second slide.

The word suggests complexity that may be unnecessary or pretentious, though it can also describe genuinely difficult material requiring specialized knowledge.

obscure

cryptically

In hidden meaning

inscrutably · incomprehensibly · unfathomably · mysteriously · nebulously · ambiguously · vaguely · indistinctly · murkily · unintelligibly

esoteric

arcanely

In occult manner

learnedly · eruditely · pedantically · philosophically · theoretically · speculatively · metaphysically · intellectually

complex

intricately

With complex detail

densely · circuitously · tangentially · indirectly · sophisticatedly · technically · demandingly · challengingly · difficultly

Opposites
comprehensibility/clarity of expression

abstruselyclearly

Without ambiguity

plainly · obviously · simply · lucidly · transparently

Family

abstruse, abstruseness

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G