improperly or insufficiently developed.
Photography. (of a negative) less developed than is normal, so as to produce a relatively dark positive lacking in contrast.
developing ( def 2 ).

1890–95; under- + develop + -ed2

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verb (used with object)
to develop (something) short of the required amount: to underdevelop film.

under- + develop

underdevelopment, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underdevelop (ˌʌndədɪˈvɛləp)
(tr) photog to process (a film, plate, or paper) in developer for less than the required time, or at too low a temperature, or in an exhausted solution

underdeveloped (ˌʌndədɪˈvɛləpt)
1.  immature or undersized
2.  relating to societies in which both the surplus capital and the social organization necessary to advance are lacking
3.  photog (of a film, plate, or print) processed in developer for less than the required time, thus lacking in contrast

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1892, in the photography sense, under + pp. of develop. In ref. to countries or regions, recorded from 1949.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

underdeveloped un·der·de·vel·oped (ŭn'dər-dĭ-věl'əpt)
Not adequately or normally developed; immature.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
We need to give because unlike us the issues in underdeveloped nations are not
  self inflicted.
We're too underdeveloped spiritually and ethically to embark on these
  activities without further corrupting our world.
Yet the animals' intestines remain thin and underdeveloped in places, bizarrely
  bloated in others.
Economists have neglected the subject for so long that their theories of how
  stimulus works are shockingly underdeveloped.
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