enigmatically
Definitions
In a manner that is difficult to interpret or understand; mysteriously.
In a way that involves or uses riddles or obscure language.
Examples
She smiled enigmatically, leaving everyone in the room wondering what she was thinking.
The author ended the novel enigmatically, refusing to reveal the true fate of the protagonist.
Synonyms
mysteriously cryptically obscurely ambiguously puzzlingly inscrutably perplexingly
Antonyms
clearly plainly obviously explicitly understandably transparently unambiguously