Definition of heartfulness in US English:

heartfulness

noun

  • The fact or quality of being heartful; sincerity or warmth of feeling or expression.

Origin

Early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From heartful + -ness.

Pronunciation

heartfulness

/ˈhɑːtf(ʊ)lnəs/