To withdraw, retract (something said). / To cause something not to have been said; to make it so that one never said something (since this is physically impossible, usually in the subjunctive).

Third-person singular simple present indicative form of unsay

present participle of unsay

(philosophy) Not capable of being said. / (rare) Not allowed or not fit to be said.

(philosophy, rare) In a manner which is inexpressible or is not describable. / (rare) In a manner which is not permitted or is inappropriate for expression.

Quality of being unsayable.

Quality of being unsayable.