a. without limits in extent, size, or quantity
Man, having explored the far corners of the earth, is now reaching out into illimitable space.
Sentence in Classic:
The chief reason was a sudden, vivid sense of the terrible contrast between something infinitely great and illimitable within him and that limited and material something that he, and even she, was.
War and Peace(V2) By Leo Tolstoy Context
They grew enthusiastic for the absolute, they caught glimpses of infinite realizations; the absolute, by its very rigidity, urges spirits towards the sky and causes them to float in illimitable space.
Les Misérables (V3) By Victor Hugo Context