Not susceptible: insusceptible to bribery. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "insusceptible" in a sentence
"If social conflict splits us, we diagnose a communication problem, a semantic setback on the road to common ground, a gap that can be bridged by consensus on facts and deliberation on goals; it's just too painful to think that tribal values impervious to rationality and insusceptible to compromise are the ineluctable driver of our divisions."
"It is a disconcerting, even radical book, and its central subject, as in much of Warner's work, is the inherent strangeness of the self, resistant to control, insusceptible to coercion, demanding one way or another to be discovered and demanding more after that."
"Because you cannot, for your statement "... those oxymorons who make it their" morally superior "business to offend ..." is, I would contend, insusceptible of having any meaning spelled out on its behalf."