self-refute

From self- +‎ refute.

self-refute (third-person singular simple present self-refutes, present participle self-refuting, simple past and past participle self-refuted)

1. (intransitive) (of an idea or theory) To prove itself false by showing that falsehood is a logical consequence of the act or situation of holding it to be true.
   • 2008, Graham Dunstan Martin, Living on Purpose: Meaning, Intention, and Value‎^[1]:

     Moreover it is philosophical suicide, since it self-refutes.

• self-refutation

Self-refuting idea on Wikipedia.Wikipedia