Use 'boundless' to emphasize the vast scope or size of something, typically positive attributes. The universe is boundless, full of mysteries yet to be discovered.
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Figurative Usage
'Boundless' is often used metaphorically, not to express physical space but qualities like generosity or opportunities. His boundless generosity made everyone in the community feel loved.
Pro Tip 3/3
Emotional Intensity
The term conveys strong, infinite emotional states when describing feelings or emotions. Her boundless joy at the news was infectious.