English idioms related to Knowledge & Understanding - Inexpertness

used to describe a person who seems to be incapable of doing something due to a lack of necessary resources or skills

used to say that someone is extremely bad at doing something

a person or thing that excels at doing only one thing

used to say that one did not have much experience with something and therefore is not very good at it

having little knowledge or experience of a particular situation or activity

to no longer be able to do a certain activity as well as one did in the past

to lack knowledge or understanding of a particular concept or term