We found one dictionary that defines the word dumbfound or dumfound:

General (1 matching dictionary)

1. dumbfound or dumfound: The Wordsmyth English Dictionary-Thesaurus

(Note: See dumbfounded as well.)

Definitions from Wiktionary (dumbfounded) ▸ adjective:  Shocked and speechless. ▸ Also see dumbfounded ▸ Words similar to dumbfound or dumfound ▸ Usage examples for dumbfound or dumfound ▸ Idioms related to dumbfound or dumfound ▸ Wikipedia articles (New!) ▸ Popular nouns described by dumbfound or dumfound ▸ Words that often appear near dumbfound or dumfound ▸ Rhymes of dumbfound or dumfound ▸ Invented words related to dumbfound or dumfound