1. Extremely
   "infernally clever"
   - hellishly

See also: infernal

• deathbed
• deathblow
• deathless
• deathlike
• deathly
• deathrate
• deathtrap
• deathwatch
• deathwatch beetle
• deb
• debacle
• debag
• debar
• debark
• debarkation
• debarment
• debase
• debased
• debasement
• debaser
• debasing
• debatable
• debate
• debater
• debauch