感恩不尽感激不尽gǎn ēn bù jìn

be most(/extremely) grateful
❍ 您多给美言几句，我～！ (老舍《茶馆》25) Put in a good word for me and I’ll be most grateful!/弟即修字数行，烦尊纪带去，便感激不尽了！ (《红楼梦》1465) I shall write a few lines to her,and if I may trouble you to pass on my letter I shall be extremely grateful!

感恩不尽ɡǎn ēn bù jìn

形容感激不尽他人的恩德。be everlastingly grateful, be most grateful

感恩不尽gǎn'ēn-bùjìn

〔述补〕 谓极其感激的言辞。《三侠五义》5回：“伸明此冤报仇雪恨，～，张三闻听他说的可怜，不由得动了豪侠心肠。”
△ 褒义。用于描写感恩。
【近义】感恩戴德感戴不浅 感戴二天