Definition of "heartfelt"

[T]hey were not the spoiled children of affectation and refinement, but a bold, vigorous, independent race of thinkers, with prodigious strength and energy, with none but natural grace, and heartfelt unobtrusive delicacy.

1820, William Hazlitt, “Lecture I. Introductory.”, in Lectures Chiefly on the Dramatic Literature of the Age of Elizabeth. […], London: Stodart and Steuart, […]; Edinburgh: Bell and Bradfute, page 2

Infused with family warmth, but with a knowing adult eye on the loss of innocence, it is one of the year's most genuinely heartfelt films.

2022 November 19, Caryn James, “Spielberg’s The Fabelmans Review: An Emotional Crowd-pleaser”, in BBC‎