adj.

1. Lacking an essential quality or element: deficient in common sense.
2. Inadequate in amount or degree; insufficient: a deficient education.

[Latin dēficiēns, dēficient-, present participle of dēficere, to fail, be wanting. See defect.]

deficient de·fi'cient n.
deficiently de·fi'cient·ly adv.

adjective

1. Lacking an essential element: defective, incomplete, lacking, wanting. See better/worse, excess/insufficiency/enough.
2. Not enough to meet a demand or requirement: inadequate, insufficient, scarce, short, shy, under, wanting. See big/small/amount, excess/insufficiency/enough.

adj

Definition: imperfect, inadequate
Antonyms: adequate, ample, enough, excessive, faultless, flawless, perfect, satisfactory, sufficient, superfluous

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A state of being in deficit.

Dansk (Danish)
adj. - mangelfuld, utilstrækkelig, udviklingshæmmet

Nederlands (Dutch)
arm aan, gebrekkig

Français (French)
adj. - défectueux, faible, insuffisant

Deutsch (German)
adj. - mangelhaft, unzulänglich

Ελληνική (Greek)
adj. - ελλιπής, ανεπαρκής, ατελής, ελαττωματικός, καθυστερημένος

Italiano (Italian)
difettoso

Português (Portuguese)
adj. - deficiente

Русский (Russian)
несовершенный, недостаточный

Español (Spanish)
adj. - deficiente, defectuoso, insuficiente

Svenska (Swedish)
adj. - bristfällig, ofullständig

中文（简体） (Chinese (Simplified))
有缺陷的, 不足的, 缺乏的, 有缺点的

中文（繁體） (Chinese (Traditional))
adj. - 有缺陷的, 不足的, 缺乏的, 有缺點的

한국어 (Korean)
adj. - 결여된, 우둔한, 불완전한

日本語 (Japanese)
adj. - 不足した, 欠陥のある

العربيه (Arabic)
‏(صفه) ناقص لشئ ضروري, غير كافي‏

עברית (Hebrew)
adj. - ‮חסר, לקוי, מפגר, לא מספיק, נעדר, נטול-‬

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