plural fiends
1
a
: an evil spirit : a demon or devil
b
: a very evil or cruel person
a murderous fiend
a fiend in human form
2
informal
a
: a person who is very enthusiastic about something : fanatic
He's a real golf fiend.
a fresh air fiend
He's a fiend for physical fitness. [=he is very devoted to physical fitness]
b
: a person who is addicted to a drug or to a kind of behavior
a dope/drug fiend [=addict]
a sex fiend
Cite this Entry
“Fiend.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/fiend. Accessed 19 Jun. 2026.
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