heartfelt

• heart-felt

heart +‎ felt

• (Received Pronunciation) IPA^(key): /ˈhɑːt.fɛlt/
• (US) IPA^(key): /ˈhɑːɹt.fɛlt/

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heartfelt (comparative more heartfelt, superlative most heartfelt)

1. Believed or felt deeply and sincerely.

   a heartfelt apology

   She expressed her heartfelt sympathies at the death of his mother.

   • 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, →OCLC, page 2:

     [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.

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

     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.

• genuine, sincere, true

• heartfeltly
• heartfeltness
• unheartfelt