We found one dictionary that defines the word testamentally:

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1. testamentally: Wiktionary

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