The word "be wails" means to cry out in mourning or grief. Its antonyms are words that mean the opposite of crying out in sorrow. One antonym is "rejoice," which means to feel or show great delight or happiness. Another antonym is "laugh," which means to express amusement or common enjoyment through making sounds with one's mouth. "Celebrate" is also an antonym for "be wails," as it means to honor or observe a special occasion in a joyful or festive way. Finally, "sing" is another antonym, as it means to produce musical sounds with one's voice, often expressing joy or in celebration.