imperfection-n; 2 Senses

Sense Number 1: a physical or structural flaw in something

Commentary: IMPERFECTION[+entity][+form][+flaw][+structure/+surface]

These dishes have slight imperfections in their glaze.
Imperfections in the steel girders may have caused the collapse of the bridge.
It's one of the imperfections of our legal system. (refers to an abstract system, structure)
Fruit suitable for gift boxes may not have imperfections on the skin.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a personality shortcoming

Commentary: IMPERFECTION[+quality][+personality][+shortcoming]
NOTE: refers to an undesirable trait in a person

The two friends overlooked each other's imperfections.
Mary cannot tolerate certain types of moral imperfection in her associates.
He has tried to overcome his imperfections.

WordNet 0.0 Sense Numbers: 1b