Antonyms for "fastens on" could include "lets go," "releases," "loosens," "detaches," "unclips," and "unfastens." These words describe the opposite action of attaching or holding onto something tightly. Instead of fixing onto an object with strength and force, these antonyms imply freedom, detachment, and loosening of control. Each word holds a unique connotation that can indicate ease, flexibility, or even carelessness. Understanding antonyms for "fastens on" can enhance a reader's comprehension of a text, allowing for a richer understanding of the author's intention and the meaning behind the chosen language.