Bounden
/ˈbaʊndən/
Definition 1 of 2
Pro Tip 1/3Moral Imperative
Use 'bounden' to express a strong moral commitment, often linked to social responsibility. 
It's our bounden responsibility to protect the environment.
Pro Tip 2/3Old-fashioned Tone
'Bounden' can feel old-timey, so it's often used to sound traditional or deliberately archaic. 
In his speech, he referred to the audience’s bounden allegiance to the crown.
Pro Tip 3/3Formal Contexts
'Bounden' suits formal occasions and documents, giving a sense of gravity and importance. 
The contract outlines your bounden obligations as a tenant.