Source: The book Strangelets by Michelle Gagon
Context: Americans. I should have known, Anat thought disdainfully.
In Their Words: Disdainfully is defined as something refused with contempt or because it is beneath you. https://www.yourdictionary.com/disdainfully
In My Words: Disdainfully means something that is rejected because it doesn’t look or isn’t as good as you or what you want it to be. For example, when you are assigned a book, you may think the book looks cheesy or bad. So you reject it, you refuse to read it because it does not look interesting.