Untroubling is an adjective that describes something that does not cause worry or distress. Its antonyms, therefore, are words that express the opposite sentiment. Some possible antonyms for untroubling include: disturbing, stressful, bothersome, upsetting, worrisome, distressing, unsettling, alarming, nerve-racking, and unsettling. These words convey a sense of unease, tension, or anxiety, and suggest that something is not going as smoothly as it should. While untroubling things are easy to handle and do not require much effort, their antonyms demand attention, energy, and sometimes even a change in behavior or mindset.