blunt [blʌnt]

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adj.（刀子）钝的，不锋利的，迟钝的，直率的

describes a pencil , knife , etc . that is not sharp , and therefore not able to write, cut , etc . well

The axe is too blunt to cut down the tree. 斧头太钝，砍不倒树。
She is rather blunt in speech. 她说话很直率。