limitless
adj.having no end or boundary. You use this to describe something that seems like it will never run out, such as energy or possibilities.
adj.without any restricted boundaries or finite end. Often used to describe abstract concepts like potential, imagination, or resources.
“The internet offers a limitless supply of information.”
“With a limitless budget, the architect was able to source the rarest materials from across the globe.”
“The philosopher argued that while the human body is physically constrained, the capacity for intellectual growth remains essentially limitless throughout a person's lifetime.”
Typically used as an attributive adjective before a noun, but can also follow linking verbs like 'seem' or 'appear'.
“Yet the state treats family care as an almost limitless free resource.”
From limit + -less.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.