The act of saying no to a request

Usage examples of naysaying.

But it is impossible to understand their naysaying in the war on terrorism today, their vicious wrath, and even their maniacal defense of Bill Clinton, without a brief review of their treachery at the onset of the Cold War.

He was Salvatore Nervi, and he wasn’t accustomed to anyone naysaying him, es­pecially not a woman he had honored with his attention.

You also want to chase down the Probe, rescue your people, single-handedly negotiate a peace treaty with the Romulans or at least with Rihan, and maybe even get a certain green-eyed musician repatriated in Federation space without anyone naysaying you.