ulterior

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” Bertrand Russell

beyond or outside an area of immediate interest; remote

• “a suggestion ulterior to the present discussion”
• “without...any purpose, immediate or ulterior” G.B.Shaw

coming at a subsequent time or stage

• “the future president entered college at the age of 16”
• “awaiting future actions on the bill”
• “later developments”
• “without ulterior argument”