The crossword solution for the term BE RUDE is STARE. Staring is a form of rudeness that can be interpreted as aggressive or intimidating. It is considered rude to STARE at someone for an extended period of time without speaking, as it can make the other person feel uncomfortable or threatened. Staring can also be seen as a sign of disrespect, as it implies that the person being stared at is not worthy of being spoken to.