Nice people and situations are enjoyable and don't cause problems. If you say something rude (or honest) to your sibling, your parents might say "Be nice!" This word is a little vague and overused. Like interesting, it's hard to know what people really mean when they say nice. One meaning is easier to figure out: if you score a goal in hockey, that was a nice shot. That means you were skillful and did well — you shot the puck nicely.