The Collaborative International Dictionary of English v.0.48:
Disoblige \Dis`o*blige"\, v. t. [imp. & p. p. Disobliged; p.
pr. & vb. n. Disobliging.] [Pref. dis- + oblige: cf. F.
1. To do an act which contravenes the will or desires of; to
offend by an act of unkindness or incivility; to
displease; to refrain from obliging; to be unaccommodating
Those . . . who slight and disoblige their friends,
shall infallibly come to know the value of them by
having none when they shall most need them. --South.
My plan has given offense to some gentlemen, whom it
would not be very safe to disoblige. --Addison.
2. To release from obligation. [Obs.]
Absolving and disobliging from a more general
command for some just and reasonable cause.