enigmatic (adj.)

1640s, from Late Latin aenigmaticus, from aenigmat-, stem of aenigma (see enigma). Enigmatical in the same sense is from 1570s. Related: Enigmatically.

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Definitions of enigmatic from WordNet

enigmatic (adj.)
not clear to the understanding;
prophetic texts so enigmatic that their meaning has been disputed for centuries
I didn't grasp the meaning of that enigmatic comment until much later
Synonyms: enigmatical / puzzling
enigmatic (adj.)
resembling an oracle in obscurity of thought;
an enigmatic smile
so enigmatic that priests might have to clarify it
Synonyms: oracular