deficient

While being deficient in magnesium can definitely affect sleep patterns, there isn't the evidence to say taking supplements will definitely improve your sleep.

Evidence shows that supplements can reduce the risk of respiratory infections, particularly in people who are deficient.

People deemed to have severely deficient autobiographical memory, or SDAM, find their episodic memories transformed into semantic ones—they know they had an experience, but are unable to replay it.

Morale is poor and training is deficient, the officer said.

But the New York lawsuit alleges that these tools are deficient, and create the illusion of control, for parents.