constrain
/kənˈstreɪn; kən`stren/ v[Tn, Cn.t]
(fml 文) make (sb) do sth by strong (moral) persuasion or by force 力劝, 强迫（某人）做某事
As an artist he didn't consider himself constrained (ie restricted) by the same rules of social conduct as other people. 他认为自己是艺术家, 不必像一般人那样要受社会行为准则的束缚.
I feel constrained to write (ie I feel I must write) and complain in the strongest possible terms. 我深感责无旁贷, 必须笔诛墨伐.