Je gaat nee moeten verkopen, maar dat zal de klant niet leuk vinden. ― You'll have to say no, but the client won't like that.
Usage notes
Mostly encountered in the infinitive.
Has a connotation of a negative response that should include some form of justification (this expectation of justification being implicit in the verb verkopen, meaning "to sell"); it implies that the addressee would be disappointed or unpleasantly surprised by the negative response.