underdeveloped - definition and synonyms

adjective 

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/ˌʌndə(r)dɪˈveləpt/
  1. 1
    economics an underdeveloped country or region is poor and does not have modern industries or advanced technology. Many people consider this to be an offensive word, and prefer to use the word developing.
  2. 2
    an underdeveloped person or body has not grown as much as it should have

    His legs were thin and underdeveloped.

derived word

underdevelopment

noun [uncountable]