The Collaborative International Dictionary
Single-hearted \Sin"gle-heart"ed\, a. Having an honest heart; free from duplicity. -- Sin"gle-heart"ed*ly, adv.
Wiktionary
a. 1 Having an honest heart; straightforward, free from duplicity. 2 devoted; unambivalent and dedicated.
Usage examples of "single-hearted".
The unpractised and single-hearted girl heard him in breathless attention, the color of her cheek and the changeful eye betraying the force of her sympathies at each turn in their hazardous adventure.
As the single-hearted Scottishman had never for a moment doubted these gods of the ancient Gentiles to be actually devils, so he now hesitated not to believe that the blasphemous hymn of the Saracen had raised up an infernal spirit.
Westernism and Slavophilism were more than ever the two heads of a single-hearted Janus.
Saints and soldiers, knights and barons, margraves, princes, kings, emperors, had come and gone, and left their single-hearted, friendly subjectfolk pretty much what they found them.