IPA: /ˈɛndləs/
KK: /ˈɛndləs/
Having no end or limit; continuous and infinite in extent or duration.
The endless sky stretched above us, making us feel small and insignificant.
Comparative: more endless
Superlative: most endless
Endless → It is formed from "end" (from Old English "endian", meaning to finish or cease) and "-less" (meaning without). The word "endless" means without an end or infinite.
Think of something that is 'without' ('-less') a 'finish' or 'cease' ('end') — that's why endless means infinite.