deficient
单词辨析：
尤指某种不可缺少之物含量不足的，常后接介词 in；也可指某事物不够好的。
He is deficient in vitamin C.
他缺乏维生素C。
They failed to meet the deadline because their time was deficient.
因为缺少时间，他们没能如期完成。
This training system is deficient.
这一训练体系存在着缺陷。
指某事物就某一特定目的而言是不够好的、不足的、有缺陷的；也可指人自认为不能胜任的。
The materials are inadequate for use.
这些资料不够用的。
The tomato supply in that area is inadequate to meet the demand.
那一地区的西红柿供不应求。
The city's recycling system is totally inadequate.
这个城市的垃圾循环系统有严重缺陷。
His partner made him feel totally inadequate.
他的同伴让他觉得自己完全不能胜任。
相关例句：
A mentally deficient person is one who is weak-minded.
一个智力上不足的人是个低能的人。
In the end, it recommends the deficient and advance in the domestic and foreign denitrification research.
最后，提出了目前国内外反硝化研究中存在的不足及发展方向。
But this is no response at all. Finance theory was also shown to be deficient.
但这样的回应跟没有回应一样。金融理论同样暴露了不足。
He never parades his abilities. A mentally deficient person is one who is weak-minded.
他从不炫耀个人的能力。一个智力上不足的人是个低能的人。
Blood tests can indicate if you're deficient in a number of key nutrients.
血液测试可以检测你是否在多个主要的营养方面摄取不足。
That excessive optimism signalled deficient demand for goods and labour.
这种过度的乐观预示着，对商品和劳动力的需求会出现不足。