1) Morally obligatory 2) Obligatory 3) Obliged 4) Under obligation 1) Obligated 2) Obligatory 
List of BS-style route diagrams used for Kintetsu lines. ...
• of Bind • (p. p & a.) Made obligatory; imposed as a duty; binding. • (p. p & a.) Bound; fastened by bonds. • (p. p & a.) Under obligation; bound by some favor rendered; obliged; beholden.
Bound'en p. p & adjective [ Old. past participle of bind .] 1. Bound; fastened by bonds. [ Obsolete] 2. Under obligation; bound by some favor rendered; obliged; beholden. « This holy word, that teacheth us truly our bounden duty toward our Lord God in every point. 
[adj] - morally obligatory
adjective morally obligatory; `my bounden duty`
obligatory; compulsory: one's bounden duty. · under obligation; obliged.