invariable
Definitions
Never changing or capable of being changed; constant.
Always occurring in the same way; uniform.
Examples
His invariable habit was to take a long walk through the park every single morning.
The invariable result of their heated arguments was a period of cold silence.
Despite the changing seasons, the temperature in the deep cave remained almost invariable.
Synonyms
constant unchanging fixed unvarying stable uniform immutable
Antonyms
variable changeable fluctuating inconsistent unstable erratic mutable