Enigmatically
/ˌenɪɡˈmætɪkli/
Definition 1 of 1
Pro Tip 1/3Subtle Confusion
Conveys slight uncertainty, leaving people guessing about true intentions or feelings. 
She responded enigmatically, leaving us unsure of her support.
Pro Tip 2/3Not Negative
While puzzling, it doesn't imply something negative, just hard to interpret. 
His enigmatically worded invitation intrigued rather than worried us.
Pro Tip 3/3Often Dramatic
May indicate drama or flair; think of characters in books or movies. 
The villain chuckled enigmatically before revealing his plan.