We found one dictionary that defines the word rulerless:

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1. rulerless: Wiktionary

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