1. A cruel wicked and inhuman person
   - monster, devil, demon, ogre 
2. An evil supernatural being
   - devil, demon, daemon, daimon 
3. A person motivated by irrational enthusiasm (as for a cause)
   - fanatic

Derived forms: fiends

Type of: disagreeable person, enthusiast, evil spirit, partisan, partizan, unpleasant person

Encyclopedia: Fiend

• smarts
• smarty
• smartypants
• smash
• smash hit
• smash-and-grab
• smash-up
• smashed
• smasher
• smashing
• smashingly
• smatter
• smattering
• SME
• smear
• smear campaign
• smear test
• smear word
• smeary
• smectite
• smegma
• smell
• smell a rat
• smell out
• smell up