WordNet sense 1 (without limits in extent or size or quantity):

illimitable, measureless, unmeasured

WordNet sense 2 (impossible to measure):

immeasurable, immensurable, unmeasurable

WordNet sense 3 (having no limits in range or scope):

unlimited

WordNet sense 4 (seemingly boundless in amount, number, degree, or especially extent):

boundless, unbounded

WordNet sense 5 (having no limits or boundaries in time or space or extent or magnitude):

infinite