1. covered with or containing scum; having a layer of froth or foam on the surface
2. morally reprehensible; contemptible or worthless
Usage: informal

Examples

• The pond was scummy after weeks without rain.
• A scummy layer formed on top of the old soup.
• The scummy water in the abandoned pool was green with algae.
• He’s a scummy person who cheats his customers.
• That was a scummy thing to do to your friend.
• The scummy landlord refused to fix the broken heating.
• She felt scummy after lying to her parents.