a. unable to be disproved; incontrovertible; undeniable
No matter how hard I tried to find a good comeback for her argument, I couldn't think of one: her logic was irrefutable.
Sentence in Classic:
This unshakable, irrefutable consciousness of freedom, uncontrolled by experiment or argument, recognized by all thinkers and felt by everyone without exception, this consciousness without which no conception of man is possible constitutes the other side of the question.
War and Peace(V6) By Leo Tolstoy Context
With the ladies, therefore, matters soon assumed vivid and definite shape; they became clearly and irrefutably materialised; they stood stripped of all doubt and other impedimenta.
Dead Souls By Nikolai Vasilievich Gogol Context