Definition of "quacky" in English

adjective

1. (of a voice or sound) That resembles the quack of a duck.

2. Fraudulent; characterised by or using the methods of quackery.

   • 1998 September 9, Joni Mitchell, interview quoted in 2003, Alan Hecht, Polio, page 72, I know this sounds real quacky but they did some mysterious good to the problem and I feel fine.

3. (US, of land or a crop) Infested with quackgrass.

   • 1859, The Cultivator, Volume 7, 3rd Series, page 54, After the first hoeing of a quacky crop, it is often well to go over it lightly in the middle of a hot day, just skimming the surface of the soil, and cutting off the young grass.
   • 1914, New York (State) Department of Agriculture, Annual Report, Volume 1, Part 2, page 544, When would you advise plowing sandy soil that is quacky for beans?