deeply indebted

Translations
глубоко в долгу
He is deeply indebted to her for their support.
Он глубоко в долгу перед ней за их поддержку.
Definitions
Having a significant amount of debt or owing a great deal to someone, often implying a strong sense of obligation or gratitude.
Words
indebted

adjective
обязанный
deeply

adverb
глубоко