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Longman Dictionary of Contemporary English
enfant terrible
noun
EXAMPLES FROM OTHER ENTRIES
▪ Venturi is the former enfant terrible of architecture.
Douglas Harper's Etymology Dictionary
enfant terrible

1851, French, literally "terrible child" (see infant + terrible). One whose unorthodox or shocking speech or manners embarrass his associates as a naughty child embarrasses his elders. French also has enfant gâté, "spoiled child," hence "person given excessive adulation."

Wiktionary
enfant terrible

n. An unconventional badly-behaved person who causes embarrassment or shock to others.

WordNet
enfant terrible

n. a person whose unconventional behavior embarrasses others

Wikipedia
Enfant terrible

Enfant terrible (; ; ) is a French expression, traditionally referring to a child who is terrifyingly candid by saying embarrassing things to parents or others. However, the expression has drawn multiple usage in careers of art, fashion, music, and other creative arts. In these careers, it implies a successful "genius" who is very unorthodox, striking, and in some cases, offensive, or rebellious.

The Oxford English Dictionary, 2nd edition, gives the definition: "A child who embarrasses his elders by untimely remarks; transf. a person who compromises his associates or his party by unorthodox or ill-considered speech or behaviour; loosely, one who acts unconventionally."

Webster's Dictionary also defines an enfant terrible as an unusually successful person who is strikingly unorthodox, innovative, and/or avant-garde.