What Is A Synonym For Constant?

What Is A Synonym For Constant? Some common synonyms of constant are faithful, loyal, resolute, staunch, and steadfast. What is a synonym and antonym for constant? constant. Antonyms: irregular, exceptional, variable, casual, accidental, incidental, broken, interrupted, inconstant, fickle, untrustworthy, faithless, treacherous, false. Synonyms: uniform, regular, invariable, perpetual, continuous, firm, fixed, steady, immutable, faithful, true, trustworthy.