The word "insanableness" refers to a state or quality of being incurable or impossible to fix. While this term might not be commonly used in everyday language, there are several synonyms that can be used to convey a similar meaning. For instance, one could use the word "irremediable" to describe a situation or condition that cannot be remedied or cured. Similarly, "hopelessness" can be employed to illustrate a state of despair or impossibility of finding a solution. Another synonym that can be used is "incurable", which suggests a condition that cannot be healed or resolved. These alternative words help to convey the idea of something being unfixable or impossible to remedy.