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fiend

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The definition of a fiend is someone who obsesses over an activity or thing.

(noun)

An example of a fiend is someone who does a lot of drugs (a drug fiend).
An example of a fiend is a constant shopper.

A fiend is defined as a person who is evil and cruel.

(noun)

An example of a fiend is someone who is not kind to animals.

See fiend in Webster's New World College Dictionary

noun

an evil spirit; devil
an inhumanly wicked or cruel person
☆ Informal
1. a person addicted to some activity, habit, etc.: a fresh-air fiend
2. a person who is excellent at some activity: a fiend at tennis

Origin: ME fend, feend < OE feond, lit., the one hating, orig. prp. < base of feogan, to hate, akin to Goth fijands < fijan, to hate < IE base *pē(i)-, to harm

See fiend in American Heritage Dictionary 4

noun

a. An evil spirit; a demon.
b. The Devil; Satan.
c. A diabolically evil or wicked person.
Informal One who is addicted to something: a dope fiend.
Informal One who is completely absorbed in or obsessed with a given job or pastime: a crossword-puzzle fiend.
Informal One who is particularly adept at something: a fiend with computers.