imperfection
n. C / U B2 Upper Intermediate US //ˌɪmpɝˈfɛkʃən// UK //ɪmpəfˈɛkʃən// im·per·fec·tion
n. a small mistake or a part of something that is not perfect. You use this to describe a tiny flaw in a person, a thing, or a situation.
n. a state or quality of being less than perfect; a specific flaw or defect in an object or person. Often used to describe minor aesthetic or functional flaws.
The diamond has a tiny imperfection that makes it unique.
The artist chose to keep the small imperfection in the painting because it added a human touch to the work.
While the software is technically flawless, its interface contains several minor imperfections that make the user experience feel slightly less intuitive than intended.
From Old French imperfeccion, see im- + perfection.