ulterior
adj.
lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
subterranean motives for murder|looked too closely for an ulterior purpose in all knowledge
adj.
beyond or outside an area of immediate interest; remote
a suggestion ulterior to the present discussion|without...any purpose, immediate or ulterior
adj.
coming at a subsequent time or stage
without ulterior argument|the mood posterior to
Synonym: later, posterior