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Not adequately or normally developed; immature: underdeveloped leaves and flowers.
(adjective)
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Processed in too weak a developing solution, or for too short a time, or at too low a temperature to produce a normal degree of contrast. Used of film.
(adjective)
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Having a low level of economic productivity and technological sophistication within the contemporary range of possibility; developing: underdeveloped countries.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.