Slimy describes something covered with a slippery, sticky, wet coating that feels unpleasant to touch. Think of how a slug feels when it crawls across your hand, or how seaweed gets when it washes up on the beach. That slick, oozy texture is sliminess.

Many creatures produce slime for protection or movement. Snails leave slimy trails as they glide along. Fish have a slimy coating that helps them slip through water and protects their skin from infection. While it might feel gross to us, slime is actually quite useful in nature.

The word also describes people who act in a dishonest, sneaky way that makes your skin crawl. A slimy character in a story might smile and act friendly while secretly plotting something selfish. When someone tries to manipulate others with fake compliments or lies, we might say they're being slimy. Just like actual slime makes you want to wash your hands, a slimy person can make you want to keep your distance. The word captures that same sense of something that seems harmless on the surface but feels wrong when you get close to it.