Is it never possible to falsify a hypothesis irrevocably?

Adolf Grünbaum

pp. 260-288

in: Sandra Harding (ed), Can theories be refuted?, Berlin, Springer, 1976

Abstract

… the physicist can never subject an isolated hypothesis to experimental test but only a whole group of hypotheses; when the experiment is in disagreement with his predictions, what he learns is that at least one of the hypotheses constituting this group is unacceptable and ought to be modified; but the experiment does not designate which one should be changed (my italics)1.