underdeveloped

adj 1 not fully grown or developed 未充分发育或发展的: underdeveloped muscles 不发达的肌肉. 2 (of a country, etc) not having achieved its potential in economic development （指国家等）经济不发达的.

under the order of, under way, under-, under-secretary, under-sexed, under-side, underachieve, underachiever, underact, underarm, underbelly, underbid, underbrush, undercarriage, undercharge, underclothes, undercoat, undercover, undercurrent, undercut, underdog, underdone, underestimate, underexpose, underexposure, underfed, underfelt, underfloor, underfoot, undergarment, undergird, undergo, undergraduate, underground, undergrowth, underhand, underhanded, underlay, underlie, underline,