Invariable rhymes with:
variable, variable, variable, amiable, enviable, irremediable, malleable, permeable, pitiable, variable
Invariable sounds like:
improbable, improbably, inoperable, invariably
variable, variable, variable, amiable, enviable, irremediable, malleable, permeable, pitiable, variable
improbable, improbably, inoperable, invariably