repudiation

(noun) rejecting or disowning or disclaiming as invalid. Synonyms: renunciation. Example: "Congressional repudiation of the treaty that the president had negotiated."

(noun) refusal to acknowledge or pay a debt or honor a contract (especially by public authorities). Example: "The repudiation of the debt by the city."

(noun) the exposure of falseness or pretensions. Synonyms: debunking. Example: "The debunking of religion has been too successful."