underdeveloped Synonyms

developing unformed unfinished undersized undergrown thin stunted small simplistic short rudimentary retarded puny unindustrialized unripe unsophisticated unindustrialised undeveloped half-baked unprogressive nonprogressive preliterate nonindustrial atavistic young weak vestigial primitive premature miniature dated crude benighted behind backward baby archaic antique antiquated antediluvian ancient depauperate diminutive dwarfish low little latent lagging inexperienced immature