Webster's 1913 Dictionary
HEARTFELT
HEARTFELT Heart "felt `, a.
Defn: Hearty; sincere.
New American Oxford Dictionary
heartfelt
heart felt |ˈhärtˌfelt ˈhɑrtˌfɛlt | ▶adjective (of a feeling or its expression ) sincere; deeply and strongly felt: our heartfelt thanks.
Oxford Dictionary
heartfelt
heart |felt |ˈhɑːtfɛlt | ▶adjective (of a feeling or its expression ) deeply and strongly felt; sincere: our heartfelt thanks.
American Oxford Thesaurus
heartfelt
heartfelt adjective her heartfelt confession: sincere, genuine, from the heart; earnest, profound, deep, wholehearted, ardent, fervent, passionate, enthusiastic, eager; honest, bona fide. ANTONYMS insincere.
Oxford Thesaurus
heartfelt
heartfelt adjective our heartfelt thanks: sincere, genuine, unfeigned, deeply felt, from the heart; earnest, profound, deep, wholehearted, ardent, fervent, passionate, enthusiastic, eager, kindly, warm, cordial; honest, bona fide; rare full-hearted. ANTONYMS insincere.
Sanseido Wisdom Dictionary
heartfelt
h é art f è lt 形容詞 〖通例 名詞 の前で 〗心の底からの, 真心のこもった 〈気持ち 願いなど 〉, 誠実な気持ちからの .