Meaning of DEFICIENT in English

DEFICIENT

1.

If someone or something is ~ in a particular thing, they do not have the full amount of it that they need in order to function normally or work properly. (FORMAL)

...a diet ~ in vitamin B.

= lacking

ADJ: usu v-link ADJ, usu ADJ in n

Deficient is also a combining form.

Vegetarians can become iron-~.

COMB in ADJ

2.

Someone or something that is ~ is not good enough for a particular purpose. (FORMAL)

...~ landing systems.

= inadequate

ADJ

Collins COBUILD.      Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) .