Insufficient: Definition, Usage & Common Mistakes

Meaning 1：not enough (insufficient)

insufficient 🔊

/ˌɪnsəˈfɪʃnt/

adj.

not enough; not having as much as needed.

Insufficient definition illustrated by a worried person facing a nearly empty pantry.

not enough 🔊

➕

/nɒt ɪˈnʌf/

adj.

Describes a quantity, amount, or degree that is less than what is necessary, required, or desired.

📁 Category：Social Economy 🔖 Level：Elementary

📘 Details & Usage

📖 Root Explanation

From Latin in- (not) + sufficere (to be enough, to provide).

💡 Mnemonic

Think: 'IN' your wallet, the funds are not SUFFICIENT. INside, it's lacking.

📖 Example

My monthly income is insufficient to cover all our bills and groceries. 🔊 My monthly income is not enough to pay for all our bills and food shopping.

🔗 Collocations

insufficient evidence – evidence that is not adequate to prove something

insufficient funds – not enough money in a bank account to cover a payment

insufficient time – not enough time available to complete a task

🔄 Synonyms

inadequate (adj.) – not sufficient to meet a need or requirement.

deficient (adj.) – lacking in some necessary quality or element.

lacking (adj.) – not present or available in sufficient quantity.

🚫 Antonyms

sufficient (adj.) – enough to meet the needs of a situation.

adequate (adj.) – satisfactory or acceptable in quality or quantity.

ample (adj.) – enough or more than enough; plentiful.

🌱 Derivatives

insufficiency (n.) – the condition of being insufficient; an inadequate amount.

insufficiently (adv.) – to an insufficient degree; not enough.

📖 Cultural Story

Derived from Latin 'insufficiens'. Entered English via Old French. Commonly used in formal assessments, audits, and legal contexts to denote a lack meeting required standards, e.g., 'insufficient evidence'.