Collocations for indebted - adj.

be, feel
remain

deeply, greatly, much, profoundly
eternally, forever
Thank you—I am forever indebted to you.

to
I am deeply indebted to all the doctors and nurses who treated me.

be
remain

heavily, highly, severely
The company is heavily indebted.
highly indebted countries

financially
I did not want to be financially indebted to him.

to
indebted to the bank