Underdeveloped
/ˌʌndərdɪˈvɛləpt/
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Definition
(adj) immature and not fully developed
Sentence Examples
She was born with underdeveloped lungs, but eventually a few steroid shots set her straight.
I found the supporting characters rather underdeveloped.
CEFR Practice Quiz
The infrastructure in the region is still largely ____, making it difficult for the local economy to grow today.