bounden

Hakon swore fealty to the King, and likewise to afford him such service as he was bounden to give him.

Man's bounden duty is everywhere and in all things to forward the progress of humanity, which is written in God's law.

But now I must ask you a painful question; but it is your bounden duty to answer it without reserve.

It is the bounden duty of those who live together to cultivate the sunny side of life.

In fact I am beginning to ask whether it be not my bounden duty to stop corresponding with my friends altogether.