unsnubbable

Percy however, being of an unsnubbable disposition, tried again to find a way into Daisy's heart, and this time he brought Hengist and Horsa, two young seagulls that he had found derelict on the rocks, hoping that he would take a paternal interest in their loneliness; but, like his great prototype, Daisy clapped his glass to his sightless eye, and "I'm damned if I see them," he said.

Punch, or the London Charivari, Volume 156, March 19, 1919 Various

And you can't snub that sort of people; they're unsnubbable. "

Elizabeth and Her German Garden Elizabeth von Arnim 1903