inadequate

形容词 inadequate:

1. (sometimes followed by `to') not meeting the requirements especially of a task
2. not sufficient to meet a need
   同义词：poor, short

1. The plan, brilliant in its conception, failed because of inadequate preparation.
   那计划的构想倒是十分宏伟，但终因准备不足而告吹。
2. Considering the losses in the disaster area, our support was an utterly inadequate measure.
   比起灾区的损失，我们的支援不过杯水车薪。
3. Inadequate food can stunt a child's development.
   食物不足能影响儿童的发育。
4. An instance of being inadequate; a failing or lack.
   不适当之处不充分的情况; 失败或缺乏
5. His income is inadequate to meet the expense.
   他入不敷出。
6. His explanation is inadequate.
   他的解释不充分。

in.ad.e.quate

adj.（形容词）
Not adequate to fulfill a need or meet a requirement; insufficient.
不充分的：没有足够的能力来实现某种需求或达到某种要求的；不足的

【引伸】
inad.equately
adv.（副词）