Most snail-like refers to a characteristic of something that is slow, sluggish, or cumbersome. The antonyms for this phrase may vary depending on the context, but some common opposites include agile, nimble, swift, sprightly, and quick. These words suggest motion, action, and liveliness, and they stand in stark contrast to the sluggish pace of a snail. Other antonyms that can be used include active, energetic, fleet, speedy, and lively. Using these antonyms can help to convey a sense of urgency or excitement, giving a more vivid and engaging impression than the slow and stodgy associations of something that is most snail-like.