imperfezione significa in inglese

fault [faults]▼(defect)
noun
[UK: fɔːlt] [US: ˈfɒlt]

faultiness▼(quality of being faulty)
noun
[UK: ˈfɔːltɪnəs ] [US: ˈfɔltɪnəs ]

flaw [flaws]▼(defect, fault)
noun
[UK: flɔː] [US: ˈflɒ]

shortcoming [shortcomings]▼(deficiency)
noun
[UK: ˈʃɔːtk.ʌm.ɪŋ] [US: ˈʃɔːrtˌk.əm.ɪŋ]

wrinkle [wrinkles]▼(fault, imperfection or bug)
noun
[UK: ˈrɪŋk.l̩] [US: ˈrɪŋk.l̩]