We found one dictionary that defines the word underworldling:

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1. underworldling: Wiktionary

Definitions from Wiktionary (underworldling) ▸ noun:  A member of an underworld. ▸ Words similar to underworldling ▸ Usage examples for underworldling ▸ Idioms related to underworldling ▸ Wikipedia articles (New!) ▸ Popular adjectives describing underworldling ▸ Words that often appear near underworldling ▸ Rhymes of underworldling ▸ Invented words related to underworldling