Synonyms for Ostensible (same or very similar meaning)
WordNet sense 1 (appearing as such but not necessarily so):
apparent, seeming
WordNet sense 2 (being or affecting or concerned with a surface; not deep or penetrating emotionally or intellectually):
superficial
WordNet sense 3 (represented or appearing as such; pretended):
ostensive
WordNet sense 4 (not genuine; imitating something superior):
counterfeit, imitative
From the ODE community, based on WordNet
add/edit