darkly

Short definition from Wiktionary

Adverb

1. 1
   With insufficient light for easy discernment or comprehension.
2. 2
   With a dark appearance.
3. 3
   In a manner which is not readily visible or noticeable; inconspicuously.
4. 4
   In a manner which retards or prevents discernment; clandestinely.
5. 5
   In a manner which is difficult to understand, or which retards or prevents understanding; incomprehensibly.
6. 6
   In a manner which tends to produce uncertainty or confusion; bewilderingly.
7. 7
   In a manner which produces an inward conviction of future misfortune; ominously.
8. 8
   In a morbid manner; morbidly, sinisterly.

Adjective

1. 1
   Relating to darkness or obscurity.