Disability generally refers to when a person has a physical or mental limitation that makes it difficult or impossible for them to do something. If someone cannot walk and must be in a wheelchair, they have a disability.
And inability refers to when someone can't do something. this can also include people with disabilities but is not limited to them. If someone is deaf, they have an inability to hear. But also, I have an inability to fly.
Liability is similar to responsibility. If I am a teacher, I have a liability to teach the students. It can also be used to refer to a person who is likely to cause damage or problems. If a blind person worked at a butcher shop, they would be considered a liability because they would be likely to hurt themselves or damage the product.
NasieMay 2018Thank you very much for your answer! It's great!