A term of contempt or insult referring to a fiendish or devilish person; someone regarded as extremely wicked or evil.
Compound of 'fiend' and 'head' (Old English 'heafod,' top or leading part). Following the pattern of insult compounds like 'blockhead,' 'bonehead,' 'knucklehead,' where '-head' indicates a person defined by their dominant negative quality.
Compound insults using '-head' (blockhead, airhead, bonehead) reveal how English speakers linguistically reduce people to a single criticized trait—the compound structure itself is psychologically reductive.
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