quackiest

Adjective

quacky (comparative quackier, superlative quackiest)

1. That resembles the quack of a duck.
   • With progressive prostration (which is more marked in young infants) and with a tone to the cry which is a sort of a thin, crowing, quacky sound, points to the existence of retropharyngeal lymphadenitis.1907, Le Grand Kerr, Diagnostics of the Diseases of Children, page 177
2. Fraudulent; characterised by or using the methods of quackery.
   • The Doctor says that some of the quackiest of the quacks are in the army.1919, Oral Hygeine, volume 9, page 921
3. (US) Infested with quackgrass.
   • 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.1859, The Cultivator, Volume 7, 3rd Series, page 54