Definition of "single-hearted" [sin•gle-heart•ed]

• Sincere and dedicated. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Compared to his duplicity, their single-hearted yearning seems almost naive."
• "But, launched out, the decision made, the line of least resistance taken, he knew, single-thoughted, single-hearted, only that he was going to Skipper."
• "Enough for me the mystery of the eternity of life, and the inkling of the marvelous structure of reality, together with the single-hearted endeavor to comprehend a portion, be it ever so tiny, of the reason that manifests itself in nature."