In very formal language "much inclined" was used, today this will sound pompous or simply stuffy to modern ears. To learners of English I would not recommend imitating this style or level of formality.
I am much inclined to think that the King must be vested with a larger share of Power than he has at present, or it will be very difficult if not impossible to restore Peace and good order, without much bloodshed.
The Papers of Thomas Jefferson, Volume 17: July 1790 to November 1790
Yes, he is very willing: this blessing of the people, it is a work whereunto he is much inclined, and wherein he is most delighted.
The Works of the Rev. William Bridge (1845)
The following excerpt is more recent, but uses the compound "nobody" which has a negative sense.
To tackle its housing and transport problems effectively, though, the valley probably needs a regional government of sorts. During the Internet boom, nobody was much inclined to think about these issues.
The Economist (2002)