na-adjective, noun
Formal or literary term describing a sincere, heartfelt, and warm attitude or treatment. Often used in written language or formal speech.
彼の懇篤なもてなしに深く感謝した。
I was deeply grateful for his cordial hospitality.
社長は懇篤な挨拶を述べた。
The company president gave a warm and sincere greeting.
The exact derivation is uncertain. The kanji 懇 (sincere, kind) and 篤 (fervent, kind) both contribute to the meaning of deep, heartfelt kindness. The word is used in formal and literary contexts.