Usage Note
Déconseiller is the antonym of conseiller (to advise, to recommend). It takes an indirect object for the person: je te déconseille ce film (I advise you against that film). It is formal enough for written French yet common in everyday speech when warning someone off something.
Examples
"Le médecin lui a déconseillé de faire du sport."
Natural Translation
The doctor advised him against doing sport.

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