The Prophet (sal Allahu alaihi wa sallam) said: "Modesty and being at a loss for words are two components of true faith, while vulgarity and long-windedness are two components of hypocrisy." [Tirmidhi]
Sometimes what others say leaves us speechless. Glib speakers get a mixture of both admiration and dislike from others. People admire them because they have the ability to immediately convey what they wish. They are disliked because we sense an element of fallaciousness in their talk and their quick responses do not allow others a chance to express their points of view.
Situations like this sometimes arise when people are being accused of something. This hadith is good news for you if you are one of those who are modest and restrained in your responses and perhaps sometimes at a loss for words when in the right.