不完善

• imperfect
• in the raw
• imperfectness
• faultiness

例句

1. 他将就使用一件不完善的工具而仍然完成了任务。
   He made out with a defective tool and still got the job done.
2. 第一架飞机是不完善的，但是并不因此就把它砸烂抛掉。
   The first airplane was not perfect but is was not chopped up and abandoned on that score.