deficient

Emphasizes the extreme and harsh nature of the deficiency.

Indicates a significant and important level of deficiency.

Indicates a minor or small level of deficiency.

Lacking in mental capacity, sometimes used in a clinical context.

Lacking in mental or cognitive abilities.

Indicates a very serious and worrying level of deficiency.

Expresses regret about a significant deficiency.

Expresses strong regret about a very inadequate situation.

Indicates a state of lacking something essential.

Indicates a transition into a state of deficiency.

To be shown to be lacking something, often after a test or trial.

Used to introduce the specific thing that is lacking.