The antonyms for "sticking fast" can be many, depending on the usage and context in which the phrase is being used. Some opposite words can be sliding, slipping, gliding, loosening up, detaching, separating, or releasing. These words represent the opposite actions of sticking fast, which implies something that adheres or clings tightly to a surface. The antonyms can be used in different scenarios, such as describing a slippery slope or a smooth surface that lacks friction. The antonyms provide a contrasting perspective and offer familiarity with a broader range of vocabulary. Hence, knowing antonyms of sticking fast can help improve one's language skills and command over the language.