However, in this organ of the excretory system, you will witness the absorption of leftover substances, including salts, minerals, vitamins and water. In this way, the majority of the waste and harmful substances is excreted out of the body in the form of semi-solid mass, called feces.
There is no such thing as petty or mean person who is happy with themselves; rather they would be described as insecure, jealous, angry, envious, spiteful, and in constant need of attention.
A callous person is insensitive or emotionally hardened. If you laugh at your little sister while she's trying to show you her poetry, you're being callous. Callous comes from the Latin root callum for hard skin. If you walk barefoot a lot, your feet will become calloused. We usually use callous in the metaphorical sense for emotionally hardened. If someone is unmoved by other people's problems, you might say he shows a callous indifference to human suffering.