ulterior

adjectives

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
subterranean, subterraneous, 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
ulterior
is similar to
far apart in relevance or relationship or kinship
"a distant cousin"; "a remote relative"; "a distant likeness"; "considerations entirely removed (or remote) from politics"
distant, remote
coming at a subsequent time or stage
"without ulterior argument"; "the mood posterior to"
later, posterior, ulterior