Situated beyond, or on the farther side. / Beyond what is obvious or evident. / Being intentionally concealed so as to deceive. / (archaic) Happening later; subsequent.

The quality of being ulterior.

The quality of being ulterior.

An alternative or extrinsic reason for doing something, especially when concealed or when differing from the stated or apparent reason.

plural of ulterior motive

In an ulterior manner.