We found one dictionary that defines the word trueheartedly:

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1. trueheartedly: Wiktionary

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