IPA: /ˈbaʊndləs/
KK: /ˈbaʊnd.ləs/
Having no limits or boundaries; infinite in extent or size.
The ocean seemed boundless, stretching far beyond the horizon.
Comparative: more boundless
Superlative: most boundless
Boundless → It is formed from "bound" (from Old English "bund", meaning to bind or limit) and "-less" (meaning without). The word "boundless" means without limits or restrictions.
Think of being 'without' ('-less') any 'limits' ('bound') — that's why boundless means having no boundaries.