Fragileness, also known as fragility, is a term used to describe something that is delicate or easily breakable. If you're looking for synonyms for fragileness, you may consider words like vulnerability, weakness, frailty, delicacy, and brittleness. These words all imply a sense of delicacy or a susceptibility to damage or harm. The term fragileness could also be substituted with terms such as fineness, subtlety, and intricacy, which speak to the intricate nature of something that is exceedingly fragile. Ultimately, whichever synonym you choose, it's clear that fragileness denotes something that requires a delicate and thoughtful approach.