The quality of having the wrong properties for a specific purpose
English: unsuitability, unsuitableness, ineptness
ineptnessEnglish
ineptness, awkwardness, clumsiness, ineptitude, maladroitness
Noun
Unskillfulness resulting from a lack of training
English: awkwardness, clumsiness, ineptness, ineptitude, maladroitness, slowness