Synonyms for Immeasurable (same or very similar meaning)
WordNet sense 1 (without limits in extent or size or quantity):
illimitable, limitless, unmeasuredWordNet sense 2 (impossible to measure):
immensurable, unmeasurableWordNet sense 3 (beyond calculation or measure):
inestimable, incomputableWordNet sense 4 (not capable of being computed or enumerated):
incalculableFrom the ODE community, based on WordNetadd/edit