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a. 1 (context of a voice or sound English) That resembles the quack of a duck. 2 Fraudulent; characterised by or using the methods of quackery. 3 (context US of land or a crop English) Infested with quackgrass.

Usage examples of "quacky".

He was just as quacky as Donald Duck, but he was no more a murderer than was that excitable mallard.