간곡해요 · 간곡했어요 · 간곡한 (+noun)
earnest, sincere, heartfelt (of a request)
Example
그는 간곡한 목소리로 도움을 부탁했어요.
He asked for help in an earnest voice.
Word parts
간 earnest+곡 thorough
Literally 'earnest and thorough' — pleading with full sincerity.
Good to know
Almost always with requests: 간곡히 부탁드립니다 'I earnestly ask you'. Pronounced [간고카다].