/ ˌenɪgˈmætɪk; NAmE / adjective
mysterious and difficult to understand :
an enigmatic smile
► en·ig·mat·ic·al·ly / -kli; NAmE / adverb :
'I might,' he said enigmatically.
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WORD ORIGIN
early 17th cent.: from French énigmatique or late Latin aenigmaticus , based on Greek ainigma riddle, from ainissesthai speak allusively, from ainos fable.