Definition of underdeveloped adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌndədɪˈveləpt//
; NAmE NAmE//ˌʌndərdɪˈveləpt//
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(of a country, society, etc.) having few industries and a low standard of living compare developed, developing, undeveloped ‘A developing country’ is now the usual expression.
See the Oxford Advanced American Dictionary entry: underdeveloped