We found one dictionary that defines the word thousandfoldly:

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1. thousandfoldly: Wiktionary

Definitions from Wiktionary (thousandfoldly) ▸ adverb:  thousandfold; by a factor of 1,000 ▸ Words similar to thousandfoldly ▸ Usage examples for thousandfoldly ▸ Idioms related to thousandfoldly ▸ Wikipedia articles (New!) ▸ Words that often appear near thousandfoldly ▸ Rhymes of thousandfoldly ▸ Invented words related to thousandfoldly