The word "imperfection" refers to something that is not perfect or lacks flawlessness. It means there is a mistake, weakness, or a small problem with something or someone. Full definition
We have one pretty console table which is nearly perfect, there are just a couple of imperfections in the marble top, but the gorgeous gold base is in perfect condition. (frenchbedroomcompany.co.uk)
The chassis is compliant, and the vehicle handles road imperfections with ease. (Autoweek.com)
Well, except for imperfections in the ceilings, but now our ceilings ARE perfect! (findingsilverpennies.com)