Abrasive describes something rough that wears away at surfaces through friction or rubbing. Sandpaper is abrasive: its rough texture scrapes away wood or paint when you rub it back and forth. Steel wool, pumice stones, and scouring pads are all abrasive materials used for cleaning or smoothing.

When you use an abrasive cleanser to remove stubborn stains from a bathtub, tiny rough particles in the cleanser grind away the dirt.

The word also describes people whose personalities feel harsh or irritating. An abrasive person might constantly criticize others, interrupt conversations, or speak in a harsh, grating tone. Like actual sandpaper rubbing against wood, an abrasive personality wears people down over time. Someone might have brilliant ideas but express them in such an abrasive way that classmates stop wanting to work with them.

Notice the difference: constructive criticism helps people improve, while abrasive criticism just makes people feel bad. A teacher who points out mistakes kindly is being helpful, while a classmate who mocks every error in a sneering voice is being abrasive. The roughness isn't physical but emotional, scraping away at someone's confidence and patience.