scummy

scum +‎ -y

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• Rhymes: -ʌmi

scummy (comparative scummier, superlative scummiest)

1. Covered in scum.

   We have to wash your trousers: they're all scummy.

   • 1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887, →OCLC:

     Now that the sun was getting high it drew thin sickly looking clouds of poisonous vapour from the surface of the marsh and from the scummy pools of stagnant water.

2. (slang) sleazy, worthless, no good
   • 2006, Arctic Monkeys (lyrics and music), “When the Sun Goes Down”:

     And what a scummy man / just give him half a chance / I bet he'll rob you if he can.