underdeveloped
🇺🇸
/ˌʌndərdɪˈveləpt/
🇬🇧
/ˌʌndədɪˈveləpt/
not fully grown or advanced, especially in industry and living standards
The underdeveloped region lacked modern hospitals and schools.
这个欠发达地区缺乏现代化的医院和学校。