We found one dictionary that defines the word extentless:

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1. extentless: Wiktionary

Definitions from Wiktionary (extentless) ▸ adjective:  (philosophy) Synonym of boundless ▸ Words similar to extentless ▸ Usage examples for extentless ▸ Idioms related to extentless ▸ Wikipedia articles (New!) ▸ Popular nouns described by extentless ▸ Words that often appear near extentless ▸ Rhymes of extentless ▸ Invented words related to extentless