unconfident 

英汉解释

adj. 缺乏信心的；犹豫的；不确信的

反义词

a.   confident

参考例句

1. The unconfident come from live pressure, but I have no pressure form live.
不自信来源于生活的压力，其实我现在不应该有什么生活压力呀？
2. Most of people will feel bashful and unconfident in the social activities.
大多数人，不同程度地会在社交活动中感到不好意思，没有自信。
3. Who on earth is more eligible is indeed quite a dispute. But China is more or less unconfident enough.
到底谁有资格的问题确实颇有争议，但中国多少显得底气不足。

英英解释

adj.
  1. lacking or marked by a lack of confidence

网络释义

unconfident
缺乏自信的; 缺乏信心;
A little unconfident
一点点不自信; 有一点彷徨;