enigmatically

About 0.13 uses per million words.

Meaning

1. adverb Acting in a manner that suggests an enigma.
2. adverb Behaving mysteriously or strangely.
3. adverb Functioning in a way that is unexplainable.

Similar words

cryptically mysteriously inscrutably peculiarly mystifyingly undecipherably indecipherably intriguingly puzzlingly obscurely

Often followed by

and that as in at to on with into