To miss or be deficient in something?

Answer 1

insufficient amount of something.

Answer 2

The term you are looking for is "lack." In a general sense, "to lack" means to be without or deficient in something essential or desirable. It can refer to a shortage or absence of a particular quality, quantity, or item.

Answer 3

but probably googling it would be the best answer

Answer 4

LACK of course

Answer 5

Lack