Ulterior (adjective)

1. Situated beyond what is visible or immediately apparent; hidden or undisclosed.
2. Existing or coming later; subsequent.

Origin:

From the latin word ulterior, meaning farther, from ulter ("farther"), from ultra ("beyond") from proto-indo-european *h₂éltero ("farther, more distant").

Examples:

1. He had an ulterior motive for wanting to join the group.
2. The company had ulterior plans to expand into new markets.
3. The ulterior meaning of the word was not immediately obvious.
4. He had ulterior goals beyond what he publicly stated.
5. The ulterior effects of the drug were not known until it was already in use.