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Use "undeterrable" in a sentence
"Obama's other option is to reduce Iran with all of its complexities into a single problem -- an existential, immediate, and undeterrable threat."
"Barnes advised against her reading the next one, ‘But my mother was undeterrable, and duly reported back that parts of it “made my eyes stand out like chapel hatpegs”.’"
"The attacks apparently unnerved Cheney to the point of his imagining Saddam Hussein to be undeterrable, an al Qaeda collaborator, and brimming with weapons of mass destruction."