The word "un-troublesome" describes something that is easy and stress-free. Antonyms for this word would include "problematic," "difficult," "challenging," and "complicated." When something is problematic, it causes issues that need to be addressed or resolved. A difficult task requires effort, skill, or patience to complete. A challenging task is one that tests your abilities or pushes you outside your comfort zone. A complicated situation involves many elements or factors that make it challenging to understand or solve. By understanding the antonyms of "un-troublesome," we can better communicate our experiences and feelings when we encounter difficult or complicated situations or tasks.