We found one dictionary that defines the word dunderwhelp:

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1. dunderwhelp: Wiktionary

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