The antonyms for the word "unsticks" include a variety of words which indicate the opposite of the act of separating or freeing something which is stuck. Some of the related antonyms include "adheres," "clings," "fixes," "glues," "sticks," and "attaches." All of these words express the idea of things staying put or not coming apart, which is contrary to unsticking. Other antonyms for unsticking include "detaching," "disconnecting," and "unfastening," which suggest the separation of two or more things that were previously joined together. To summarize, antonyms for unsticking are words that indicate a lack of detachment or removal, and instead imply fixation, adhesion or attachment.