unappropriateness means synonym of inappropriateness. Lexicurio rates it Sui generis — a strength score of 96 out of 100.
noun
- Synonym of inappropriateness.“[…] and yet the impropriety, the unappropriateness of wearing it at such a time was almost "past speaking of," Mrs. Drainham felt. "You should wear nothing but jet ornaments with such deep mourning," she said.”