We found one dictionary that defines the word mistightened:

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1. mistightened: Wiktionary

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