invariable
invariable; unchanging
adjective een-bah-RYAH-bleh Rare
Origin: From Latin invariabilis.
Usage Note
Invariable is used in grammar (an adjetivo invariable does not change for gender or number) and in everyday speech to describe a routine that never varies. It ends in -e, so it has a single form for masculine and feminine; the plural is regular invariables.
Examples
"Su horario es completamente invariable."
Natural Translation
His schedule is completely unchanging.

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