There are several synonyms for the phrase "look defiantly." These synonyms include staring, glaring, scowling, sneering, leering, and eyeballing. Each of these words carries a slightly different connotation, but all generally convey a sense of challenging or confronting another person or situation. When someone looks defiantly, they are often trying to communicate their strong opposition or displeasure with a situation. It is important to note that looking defiantly can sometimes come across as aggressive or confrontational, so it is important to be mindful of one's body language and tone in these situations.