We found one dictionary that defines the word guessless:

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1. guessless: Wiktionary

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