It's Very Sharp

Riddle: Sometimes I shine, sometimes I’m dull, sometimes I am big, and sometimes I am small. I can be pointy, I can be curved, and don't ask me questions because even though I'm sharp, I’m not smart enough to answer you. What am I?

Answer: A knife.

Source: https://www.riddles.com/10627

Sometimes I shine, sometimes I’m dull, sometimes I am big, and sometimes I am small. I can be pointy, I can be curved, and don't ask me questions because even though I'm sharp, I’m not smart enough to answer you. What am I? — It's very sharp by kanish v1.

Riddle: Sometimes I shine, sometimes I’m dull, sometimes I am big, and sometimes I am small. I can be pointy, I can be curved, and don't ask me questions because even though I'm sharp, I’m not smart enough to answer you. What am I? Answer: A knife. — by kanish v2.