We found one dictionary that defines the word threadily:

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1. threadily: Wiktionary

Definitions from Wiktionary (threadily) ▸ adverb:  In a thready manner. ▸ Words similar to threadily ▸ Usage examples for threadily ▸ Idioms related to threadily ▸ Wikipedia articles (New!) ▸ Words that often appear near threadily ▸ Rhymes of threadily ▸ Invented words related to threadily