constant
con-stant
adjective
Remaining the same over time; occurring continuously or regularly without interruption.
"She faced constant criticism from her boss."
noun
A quantity or value that remains fixed and does not change.
"The speed of light is a universal constant."
Thesaurus
Synonyms: unvarying, invariant, invariable, changeless, continuous, uninterrupted, unceasing, never-ending, ceaseless, unremitting, incessant, perpetual
Antonyms: inconstant