This reminds me of my younger self. Well, I'm also a shy person, and I did the same: I tried to keep my answers as short and concise as possible. I bombed an interview. Later I thought it was wrong to judge me that way (she called me un-genuine or something similar, because my responses were so short), however I was qualified and I was truthful. I went back and redid the interview, told all what happened. And I volunteered to redue the interview, because I thought it was an important lesson, even though the interviewer was not fair. I added more words to complete the interview, and got the job. The reason I thought it was a good lesson was because.. being concise is the the best idea for verbal conversations. More words add more understanding, and you get to show why your response is so brilliant. But it's also more social to say more. I've been told by an outgoing person that he judges people who do not talk much to him. I thought that was unfair or a rude thing to tell me, but I recalled that others may not connect either.. if there is almost no talking. So it was another part of the lesson to say more. I've gotten compliments on the telephone, while stuttering, when adding more words. Perhaps there is some kind of subconscious thing that happens. Even people who are trying to be polite, may be uncomfortable. So... Adding more words is important. I don't think I was blaming myself; But I knew I could encounter such people again.. because I also, sometimes feel something is wrong when someone says so little, and have no stutter. And keep in mind you don't have to be perfect. You can stutter. Let go of the pressure one may be feeling about stuttering. Also adding more words may show more personality or may inadvertently let them know more about you, and that's good. So I'm referring to the unplanned words that comes to mine, but would help the situation or something a little funny. Of course you are always following the lead of the interviewer.