Smooth describes a surface without bumps, rough spots, or irregularities. When you run your hand across a smooth tabletop, you don't feel any scratches or splinters. Ice is smooth and slippery, while sandpaper is rough and abrasive. A smooth stone has been worn down by water until all its jagged edges are gone.

The word also describes movement that's steady and graceful, without jerks or interruptions. A smooth dancer glides across the floor effortlessly. An airplane makes a smooth landing when it touches down gently instead of bouncing. When a project goes smoothly, everything proceeds without problems or delays.

When describing people, smooth can mean polished and confident, especially in social situations. A smooth talker speaks easily and persuasively, though the phrase can suggest someone who's a bit too slick or manipulative. You might describe a musician's performance as smooth when they play without mistakes and make difficult passages sound effortless.

In cooking, smooth means blended without lumps: smooth peanut butter versus chunky peanut butter, or a smooth soup that's been pureed instead of left with vegetable pieces floating in it.