single-hearted

adjective
sin·gle-heart·ed | \ ˌsiŋ-gəl-ˈhär-təd \

Definition of single-hearted 

: characterized by sincerity and unity of purpose or dedication

Other words from single-hearted

single-heartedly adverb
single-heartedness noun

First Known Use of single-hearted

1577, in the meaning defined above

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The first known use of single-hearted was in 1577

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