imperfect

名词 imperfect:

1. a tense of verbs used in describing action that is on-going
   同义词：progressive, progressive tense, imperfect tense, continuous tense

形容词 imperfect:

1. not perfect; defective or inadequate
2. having the attributes of man as opposed to e.g. divine beings
   同义词：fallible, frail, weak

1. He had only an imperfect understanding of his task.
   他对自己的任务只是一知半解。
2. The quality or condition of being imperfect.
   不完美不完美的状态或性质
3. Imperfect articles are rejected by our quality control.
   我们进行质量检验时，有缺陷的产品均予剔除。
4. We live in an imperfect society.
   我们生活在一个不完美的社会中。

im.per.fect

adj.Abbr. imp.,imperf.（形容词）缩写 imp.,imperf.
Not perfect.
不完美的
Grammar Of or being the tense of a verb that shows, usually in the past, an action or a condition as incomplete, continuous, or coincident with another action.
【语法】 未完成过去时的：属于或作为动词的一个时态的，该时态表示一个动作或状态是未完成的、延续的或与其他动作同时发生的，通常用过去时
Botany Having either stamens or a pistil only. Used of a flower.
【植物学】 不完全的：只有雄蕊或雌蕊的。用于描述花
Law Not legally enforceable:
【法律】 在法律上不能实施的：
例句：
an imperfect contract.
不能履行的合同

n.Abbr. imp.,imperf.（名词）缩写 imp.,imperf.
A piece of merchandise having a minor flaw that does not impair its use, usually sold at a discount.
处理品，瑕疵品：有小缺陷但不影响其使用的商品，通常打折出售
Grammar
【语法】
The imperfect tense.
未完成式
A verb in the imperfect tense.
未完成式动词

来源：
Middle English imparfit
中古英语 imparfit
from Old French imparfait
源自 古法语 imparfait
from Latin imperfectus
源自 拉丁语 imperfectus
in- [not] * see in-
in- [不] *参见 in-
perfectus [perfect] * see perfect
perfectus [完美的，完成时的] *参见 perfect

【引伸】
imper.fectly
adv.（副词）
imper.fectness
n.（名词）