Antonyms for the phrase "move gently" can include "jolt," "shake," "toss," "heave," "thrust," or "jerk." These words all convey a sudden, forceful movement that is the opposite of the slow, delicate motion implied by "move gently." Other antonyms might include "hurl," "throw," "slam," or "launch," which suggest aggressive actions taken with great force. By contrast, "move gently" suggests a soft touch or a gentle motion, such as the swaying of trees in a breeze, the rocking of a boat on calm waters, or the gentle lullaby of a mother to her child.