underdeveloped(having a low level of economic productivity and technological sophistication) adjective [UK: ˌʌn.də.dɪ.ˈve.ləpt] [US: ˌʌn.dər.dɪ.ˈve.ləpt]
undeveloped(lagging behind others, especially in economic or social matters) adjective [UK: ˌʌn.dɪ.ˈve.ləpt] [US: ˌʌn.də.ˈve.ləpt]