In a baffling or puzzling manner.
In a morbid manner; morbidly, sinisterly
With a dark appearance
In a manner which is not readily visible or noticeable; inconspicuously
In a manner which retards or prevents discernment; clandestinely
With insufficient light for easy discernment or comprehension
In a manner which is difficult to understand, or which retards or prevents understanding; incomprehensibly
In a manner which tends to produce uncertainty or confusion; bewilderingly
In a manner which produces an inward conviction of future misfortune; ominously
Relating to darkness or obscurity.