flaw

A flaw is a weakness or a fault in someone or something.

When we talk about flaws, we often think about people's personalities. For example, if your friend has a tendency to interrupt others when they speak, that could be considered one of their flaws. On the other hand, flaws can also refer to things, like a building with cracks in its walls (physical flaws) or a system that's prone to errors (technical flaws). In general, though, we tend to use the word flaw when talking about human qualities – like honesty or patience – and how someone might be lacking in those areas.