Illimitable, a.
Etymology: [Pref. il- not + limitable: cf. F. 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.
Syn. -- Boundless; limitless; unlimited; unbounded; immeasurable; infinite; immense; vast. -- Il*lim"it*a*ble*ness, n. -- Il*lim"it*a*bly, adv.
Shades of meaning
Fernald has no entry of its own for illimitable; he lists it under infinite.
Where he writes about it:
So, too, boundless, illimitable, limitless, measureless, and unlimited are loosely used in reference to what has no apparent or readily determinable limits in space or time; as, we speak of the boundless ocean. — from infinite