adj. limitless, unbounded, unlimited; illimitable, vast, endless, unending, infinite, immense, enormous, immeasurable, incalculable, measureless, unrestricted, unchecked, inexhaustible, unstoppable, unbridled, uncontrolled, Literary vasty: How can you keep up with a teenager's boundless energy?
BOUNDLESS
Meaning of BOUNDLESS in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012