We found one dictionary that defines the word thunderheaded:

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1. thunderheaded: Wiktionary

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