We found one dictionary that defines the word penumbrally:

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1. penumbrally: Wiktionary

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