1. (

• subterranean ,
• subterraneous ,
• 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 ;

2. (

• ulterior

) 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 ;

3. (

• later ,
• ulterior ,
• posterior

) coming at a subsequent time or stage; "without ulterior argument"; "the mood posterior to" ;