We found one dictionary that defines the word restraintless:

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1. restraintless: Wiktionary

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