deficient

/dɪˈfɪʃənt/ Formal

Say it: dih-FISH-unt

1. adjective Not having or containing enough of a necessary quality, ingredient, or element.
The patient's diet was deficient in essential vitamins.
2. adjective Not up to a normal standard or quality; inadequate or incomplete.
The prosecution's case was found to be deficient and the charges were dropped.

📖 Seen in the wild

The soil was deficient in essential nutrients, leading to stunted plant growth.
collected by @vocablast

✏️ deficient in a sentence

The audit revealed that the company's security measures were seriously deficient.
His apology was deficient in sincerity.
Without proper sunlight, the plants grew tall but were nutritionally deficient.
The initial draft of the proposal was so deficient that it had to be rewritten from scratch.
Critics argued the new law was morally deficient because it ignored the needs of the poor.
She felt deficient as a parent when she could not answer her child's simple question.

🔁 Synonyms & antonyms

lacking inadequate insufficient wanting substandard meager scant

lacking · a more neutral term that simply states something is missing.

inadequate · implies a failure to meet a specific standard or requirement.

insufficient · focuses specifically on not having enough in quantity or number.

wanting · a slightly more formal way to say lacking, often implying a failure to satisfy.

Opposites: sufficient, adequate, abundant, complete

🌱 Where it comes from

The word comes from the Latin verb 'deficere', meaning 'to fail' or 'to be wanting'. It is built from 'de-' ('away from') and 'facere' ('to make, to do'), painting a picture of something that has been 'un-made' or has fallen away from completeness.

🧩 How it's used

Common patterns:

deficient inseriously deficientwoefully deficientfound to be deficientmorally deficient

Deficient is a formal word used to point out a lack or shortcoming. It is almost always followed by the preposition 'in', as in 'deficient in iron'. Do not confuse it with 'defective', which means something is broken or has a flaw; a car with a missing engine is deficient, while a car with a faulty engine is defective.

Word family: deficiency, deficit, deficiently

💬 Quick answers

What does deficient mean?

It means lacking a necessary quality or element, or not being up to a normal standard.

What is the difference between deficient and insufficient?

Deficient often describes a lack in quality or a necessary component, like vitamins, while insufficient usually refers to a lack in quantity or amount, like money.

What is the difference between deficient and defective?

Something that is deficient is missing a part or is incomplete. Something that is defective has a flaw or does not work correctly.

Is 'deficient' a negative word?

Yes, it carries a negative connotation because it highlights a weakness, flaw, or inadequacy.

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