underdeveloped /ˌʌndɚdɪˈvɛləpt/ adjective /ˌʌndɚdɪˈvɛləpt/
adjective
Learner's definition of UNDERDEVELOPED
[more underdeveloped; most underdeveloped]
1
: not developed to a normal size or strength发育不健全的 2
of a country, society, etc. : having many poor people and few industries欠发达的