Toughness is the quality of being strong enough to handle difficult situations without giving up or falling apart. A tough person keeps going when things get hard, whether that means finishing a challenging assignment, dealing with disappointment, or standing up for what's right even when it's uncomfortable.

Physical toughness means your body can endure strain and pain. A marathon runner develops toughness by training through sore muscles and fatigue. Mental toughness means your mind stays focused and determined even when you feel frustrated or discouraged. When you struggle with a math problem for twenty minutes and still keep trying different approaches, that's mental toughness.

Toughness isn't about never feeling scared, sad, or tired. It's about feeling those things and continuing anyway. A student who gets nervous before every oral presentation but gives it anyway shows real toughness. Someone who loses a competition but practices harder for next time demonstrates toughness.

The word can also describe physical durability. A tough material like leather or steel can withstand rough treatment without breaking. Tough meat is hard to chew (which isn't a compliment). When something is tough, it can take a beating and keep functioning, whether that's a person, a backpack, or a pair of boots built to last.