" unvarying "

1: not undergoing a change in condition;

  * e.g., " ... an unvarying dedication to the welfare of her community "

•  Synonyms : 

•  changeless,

•  constant,

•  stable,

•  stationary,

•  steady,

•  unchanging

•  Antonyms : 

•  capricious,

•  changeful,

•  changing,

•  fickle,

•  fluctuating,

•  fluid,

•  inconstant,

•  mercurial,

•  skittish,

•  uncertain,

•  unpredictable,

•  unsettled,

•  unstable,

•  unsteady,

•  varying,

•  volatile

2: not varying;

  * e.g., " ... unvarying temperatures and humidity are best for the preservation of ancient artifacts "

•  Synonyms : 

•  even,

•  invariant,

•  steady,

•  unchanging,

•  undeviating,

•  uniform,

•  unwavering

•  Antonyms : 

•  changing,

•  deviating,

•  nonuniform,

•  unsteady,

•  varying