Webster's Revised Unabridged Dictionary · 1913

Illimitable

Illimitable , adjective

[Prefix il- not + limitable: compare French illimitable.]

Incapable of being limited or bounded; immeasurable; limitless; boundless; as, illimitable space.
The wild, the irregular, the illimitable, and the luxuriant, have their appropriate force of beauty. — De Quincey