1.Definition: having no limits in range or scope

"The limitless reaches of outer space"

Related Adjective(s):unlimited

2.Definition: seemingly boundless in amount, number, degree, or especially extent

"A limitless supply of money"

Related Adjective(s):boundless, unbounded

3.Definition: without limits in extent or size or quantity

"Limitless vastness of our solar system"

Related Adjective(s):illimitable, measureless, unmeasured