7 words to avoid in IELTS writing We write so many words and phrases in our daily life that they become a part of our writing. Since IELTS writing (specifically, essay writing) is academic, we need to be more careful about our word choice. So try avoiding these common informal words in your writing. However, in informal letter writing (not informal letters) you are allowed to use some colloquial. Kids: The word 'kid/kids' is used extensively in informal writing but should be avoided in a formal essay. Instead of using kids, use: children, youth, youngsters, or teenagers . To mean someone really young, use ' infants '. More and more: 'More and more' might sound okay when we talk, this is not an academic expression. Simply replace it with the word ‘ more ’. So-so: Another word that we use in our daily conversations, but should be avoided in a formal writing. Instead use: average, ordinary, mediocre or uninspiring ...