1. Without light
   "the river was sliding darkly under the mist"
   - in darkness, blackly 
2. In a dark glowering menacing manner
   "he stared darkly at her"
   - blackly

See also: dark

• causally
• causation
• causative
• cause
• cause célèbre
• cause of action
• cause of death
• cause to be perceived
• cause to sleep
• causeless
• causer
• causerie
• causeway
• causey
• causing
• caustic
• caustic lime
• caustic potash
• caustic remark
• caustic soda
• caustically
• cauterant
• cauterisation
• cauterise
• cauterization