Here is a list of excellent words that I frequently use in complaint correspondence. Remember you should remain objective when it comes to describing events but you can say how you felt about them. Don’t exaggerate. Various words carry differing levels of strength so you should use what you believe is proportionate. Use these words carefully. More tips about how to complain effectively here.
Often used with “really”, “absolutely”, “blatantly” and “utterly”
You can use these when describing the service you have received about a faulty item or poor service etc. This will help when you include your rights under the relevant laws, in particular the Consumer Rights Act 2015
You can also get more advice, tips, information and templates for your letters and further information in the book How to Complain: The Essential Consumer Guide to Getting Refunds, redress & Results!
What words do you like to use in your complaint correspondence?