The Queen's English

his biting sarcasm

Provided that it is done well, a really passionate speech is far more persuasive than a balanced one. If you are trying to convince your audience of something then a totally biased presentation often works best, whatever the ethics of it might be

Italian: many culinary and musical terms, such as pizza, al dente (cooked but firm) and lento (slowly); piazza (open town square). Of these, only al dente is usually printed in italics, with the rest treated as assimilated into English.
Latin: ad hoc (for a particular purpose, like a committee to plan an anniversary celebration), annus horribilis (awful year, as used by Queen Elizabeth II); bona fide (genuine), carpe diem (seize the day), caveat emptor (buyer beware), CV (curriculum vitae, career summary), mea culpa (I am to blame), pro bono or pro bono publico (for the public good, as when a lawyer helps a charity without charge), tempus fugit (time flies).