Slacken
Unfasten
Unfasten verb - To disengage the knotted parts of.
Slacken and unfasten are semantically related. Sometimes you can use "Slacken" instead a verb "Unfasten".
Nearby Word: unfastening
Mutual synonyms
Cite this Source
Unfasten and Slacken. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/slacken/unfasten
Slacken & Unfasten. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/slacken/unfasten>.
Unfasten or Slacken. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/slacken/unfasten.
Google Ngram Viewer shows how "slacken" and "unfasten" have occurred on timeline