The antonyms for the phrase "with beat" can be various depending upon the context. If we talk about music or dance, then some of the antonyms would be "without rhythm," "off-beat," or "out of sync." In the context of sports or games, the opposite of having a beat could be "all over the place," "disorganized," or "chaotic." Alternatively, if we talk about emotional states, then the antonyms could be "calm," "relaxed," or "tranquil." When the term "with beat" is used to describe the speed of someone's heart, the antonyms might be "slow," "steady," or "normal." Hence, the antonyms for "with beat" vary depending on the context in which the term is used.