The phrase "like a bat out of hell" is often used to describe someone or something moving very quickly, often recklessly or uncontrollably. Antonyms for this phrase could include words like "slowly," "deliberately," and "cautiously." Alternatively, more specific antonyms might include phrases like "like a turtle," "like a snail," or "like molasses in January." These antonyms paint a picture of someone or something moving slowly and deliberately, as if taking their time and being careful not to rush or make mistakes. While not necessarily negative in connotation, these antonyms provide a stark contrast to the reckless and rapid movement implied by the original phrase.