misfeature
/mɪsˈfɛktʃər/Definitions
1. noun
An unwanted or undesirable feature of a system, product, or process.
“The software’s complexity is a misfeature that makes it difficult to use for beginners.”
2. verb
To include or introduce a misfeature into something.
“The developers misfeature the new app by adding too many in-app purchases.”