We found one dictionary that defines the word looseheaded:

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1. looseheaded: Wiktionary

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