constant Synonyms

perpetual unvarying continual fixed steadfast permanent invariable unceasing firm unchanging never-ending changeless unremitting ceaseless incessant timeless successive sustained trusty trustworthy true-blue true tireless unwearied turreted unbroken unshakable unrelenting unmovable uncreated uniform unform unflinching unfailing undying undifferentiated successional still steady seamless scientific same running rhythmic reverseless resolute resistant repetitive repeated reliable