underdeveloped
[adjective]
Synonyms: backward, behindhand, undeveloped, unprogressive

[TahlilGaran] English Synonym Dictionary ▲

un‧der‧de‧vel‧oped /ˌʌndədɪˈveləpt◂ $ -dər-/ adjective

1. underdeveloped country/region etc a country, area etc that is poor and where there is not much modern industry ⇒ developing country

2. not having grown or developed as much as is usual or necessary:
a baby born with underdeveloped kidneys
—underdevelopment noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲