#1
fiend n. [
monster, devil, demon, ogre] a cruel wicked and inhuman person
. wn #2
fiend n. [
devil, demon, daemon, daimon] an evil supernatural being
. wn #3
fiend n. [
fanatic] a person motivated by irrational enthusiasm (as for a cause); "A fanatic is one who can't change his mind and won't change the subject"--Winston Churchill
. wn