underdeveloped
[ˌʌndərdɪˈveləpt]
adj.
未充分发育或发展的;
（国家等）经济不发达的;
足的;
v.
（使）发展不完全，（使）显影不足( underdevelop的过去式和过去分词);
例句:
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Underdeveloped countries should be assisted by allowing them access to modern technology.
应该通过提供现代技术来帮助不发达国家。
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China is also is underdeveloped if one excludes its cities.
来自SA
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His theory was inapplicable to many underdeveloped economies.
他的理论对很多欠发达经济体都不适用。
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The prints were underdeveloped.
这些照片显影不足.
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In fact, the market is generally seen as underdeveloped.
来自WSJ
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Yet the market for that type of protection remains underdeveloped.
来自WSJ