The phrase "sticked fast" means to be firmly or securely fixed in place. Antonyms for this phrase could include words like loose, unattached, or free. If someone is stucked fast, they are immobile, so the opposites would imply mobility, movement, or detachment. Other antonyms could include terms like unrestrained, unbound, detached, disengaged, liberated, or released. These words suggest the opposite of being held in one place and instead imply a sense of freedom or liberation. Depending on the context in which the phrase is used, different antonyms might be more appropriate.