obliged

To be required by law.

To be required by a legal statute.

To feel an ethical or moral duty to do something.

A formal way to say 'thank you very much'.

To be required by the terms of a contract.

Can mean either being forced to do something or feeling grateful.

To feel a moral or social duty to do something.

Used to specify the person one is grateful to (e.g., obliged to you).

Used to specify the reason for gratitude (e.g., obliged for your help).