un·der·de·vel·oped 
/ˌʌndɚdɪˈvɛləpt/ adjective
/ˌʌndɚdɪˈvɛləpt/ adjective [more underdeveloped; most underdeveloped] 1 : not developed to a normal size or strength
▪ The baby was born with underdeveloped lungs. 2 of a country, society, etc. : having many poor people and few industries
▪ underdeveloped nations
▪ The baby was born with underdeveloped lungs.
▪ underdeveloped nations
