Upsetting is a term often used to describe something that is distressing or disturbing. There are many similar words that can be used to express the same sentiments. Words like unsettling, disturbing, troubling, alarming, worrisome, or nerve-wracking can all be used to describe something that causes discomfort or distress. Unnerving, discomfiting, or unsettling all imply a sense of unease or discomfort. Distressing, worrying, and alarming can be used to describe something that causes concern or distress. Nerve-wracking can be used to describe something that is especially stressful or challenging. Regardless of the word used, it's clear that any of these synonyms for upsetting can convey a similar sense of unease or discomfort.