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The direct preposition of deficient (lacking) is "in."

e.g. He was deficient in mathematical ability. (There was a deficiency.)

It might also use "to" or "with" if the deficiency is being modified.

e.g. The work was deficient to some degree. (e.g. in some way)

e.g. The car is deficient with respect to its braking.

NOTE : one cannot be deficient "at" something

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11y ago

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