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.
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insufficient amount of something.
To be good at something could be proficient. To be bad at something could, therefore, be deficient. Deficient is an antonym for proficient.
To be good at something could be proficient. To be bad at something could, therefore, be deficient. Deficient is an antonym for proficient.
deficient
no. its a type of number. as in, a number can be deficient.
deficient