deficient
adj.adj. not having enough of something that is necessary, like a vitamin or a specific skill.
adj. lacking in a necessary quality, element, or amount. Often used in medical or technical contexts to describe a shortage that prevents proper functioning.
His diet is deficient in vitamin C.
The inspection found that the building's fire safety measures were deficient and required immediate upgrades.
While the theory was elegant in its simplicity, it proved deficient when applied to real-world data that accounted for environmental variables the researchers had initially ignored.
From Latin deficiens, present participle of deficere (“to lack, fail, be wanting”); see defect.
Commonly followed by the preposition 'in'.
The report was deficient of details.The report was deficient in details.The adjective 'deficient' collocations with 'in' rather than 'of' when specifying what is lacking.