FIXED Synonyms: 477 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/fixed
WebSynonyms for FIXED: stable, unchangeable, certain, unchanging, final, settled, determinate, frozen; Antonyms of FIXED: adjustable, negotiable, changeable, variable, unspecified, indefinite, unstable, uncertain.
DA: 34 PA: 6 MOZ Rank: 76