Staid, Stoic, Discredit, Disparage, Plagiarism, Caustic, Incorrigible, Ingrate, Insolent, Notorious, Sanction

staid- unemotional; serious
stoic- indifferent to pleasure or pain; impassive
discredit- to cause to be doubted
disparage- to speak in a slighting way or negatively; to belittle
plagiarism- the act of passing off the ideas or writing of another as one's own
caustic- bitingly sarcastic or witty
incorrigible- unable to be reformed
ingrate- an ungrateful person
insolent- insulting in manner or speech
notorious- known widely and usually unfavorably; infamous
sanction- an economic or military measure put in to punish another country

The worst part of fifth grade was having to deal with the assistant principal. He was notorious for being a real jerk. He would say these tart and caustic remarks that would discredit his year of learning childhood development. He would disparage the children of the school. Once we thought he was joking, but he remained so staid while he said it. Only the stoic kids could deal with him. Once, one of my classmates was accused of plagiarism. I stood up for him and told them how I saw him working hard on it. He called me an ingrate and said I should be thankful for the education that I am getting and not meddling in his business in a very insolent manner. At first I thought that he could learn how to deal with kids, but I learned that he was incorrigible. He is like a dictator waiting to see where he can sanction next for no reason.