arcane

cryptic

ˈkrɪptɪk

adjective

having a meaning that is mysterious or obscure.

he found his boss’s utterances too cryptic

enigmatic,mysterious,hard to understand,confusing,mystifying,perplexing,puzzling,obscure,abstruse,arcane,oracular,Delphic,ambiguous,elliptical,oblique,as clear as mud

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abstruse

/æbˈstrus/
/əbˈstrus/

adjective

Difficult to understand; obscure.

an abstruse philosophical inquiry

obscure,arcane,esoteric,little known,recherché,rarefied,recondite,difficult,hard,puzzling,perplexing,enigmatic,inscrutable,cryptic,Delphic,complex,complicated,involved,above one’s head,over one’s head,incomprehensible,unfathomable,impenetrable,mysterious

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