We found one dictionary that defines the word testless:

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1. testless: Wiktionary

Definitions from Wiktionary (testless) ▸ adjective:  Without a test. ▸ Words similar to testless ▸ Usage examples for testless ▸ Idioms related to testless ▸ Wikipedia articles (New!) ▸ Popular nouns described by testless ▸ Words that often appear near testless ▸ Rhymes of testless ▸ Invented words related to testless