benign

benign — adjective

1. Describing a person who is friendly, gentle, and treats others with warmth, ofte

1.adjectiveC1
Definition

Describing a person who is friendly, gentle, and treats others with warmth, often with a calm or fatherly air.

Example

Mr. Alvarez gave the children a benign smile as they crowded into his bookshop.

attributive: a benign smile / look / expression

The old judge had a benign manner that put nervous witnesses at ease.

collocation: benign manner / presence

Common collocations
  • benign smile
  • benign expression
  • benign manner
  • benign gaze
  • benign old man
Synonyms
  • kindly

    very close in meaning; slightly warmer and less formal

  • gentle

    focuses on softness of action; 'benign' adds an air of goodwill

  • gracious

    stresses polite generosity, often toward someone of lower rank

Antonyms
  • hostile

    openly unfriendly or aggressive

  • stern

    harsh and serious in manner, the opposite of a benign expression

Usage Note

Often attributive before nouns describing facial expression, manner, or presence (smile, look, gaze, expression). Tends to suggest a calm, slightly distant warmth — not the same lively friendliness as 'kind' or 'warm'.

Common Mistakes

My friend gave me a benign hug after I won.
My friend gave me a warm hug after I won.
'benign' suggests calm, gentle goodwill, not enthusiastic affection between equals.

2. Having no power to cause damage, suffering, or trouble — for example, a mild cli

2.adjectiveC1
Definition

Having no power to cause damage, suffering, or trouble — for example, a mild climate, a harmless chemical, or a government policy that produces no bad effects.

Example

The island enjoys a benign climate, with warm days and cool sea breezes all year.

collocation: benign climate / weather / environment

What seemed like a benign software update wiped half the photos from Xiomara's phone.

contrast pattern: seemingly benign … but harmful

Common collocations
  • benign climate
  • benign neglect
  • seemingly benign
  • benign influence
Synonyms
  • harmless

    plainer everyday word; 'benign' is more formal

  • innocuous

    very close; stresses that something looks dangerous but isn't

  • favorable

    stronger — actively helpful, not just non-harmful

Antonyms
  • harmful

    actively causes damage

  • hostile

    of an environment or climate, actively unfriendly to life

Usage Note

Frequently modified by 'seemingly', 'apparently', or 'completely' to set up a contrast with hidden danger. Subjects are typically things that could plausibly cause harm (climate, chemical, policy, software, organism), so 'benign' specifically denies that potential.

Common Mistakes

The rock on the table is benign.
The rock on the table is harmless.
'benign' is reserved for things that might reasonably be expected to cause harm; an ordinary rock isn't a candidate.

3. Used about a lump or growth in the body to say that it is non-cancerous, will no

3.adjectiveC1
Definition

Used about a lump or growth in the body to say that it is non-cancerous, will not spread, and poses no real threat to the patient's life.

Example

After a week of waiting, the doctor told Renata the lump in her breast was benign.

predicative: the [tumor / lump / growth] is benign

Most moles on the skin are benign and never need to be removed.

collocation: benign mole / cyst / lesion

Common collocations
  • benign tumor
  • benign growth
  • benign cyst
  • benign mole
  • turn out to be benign
Synonyms
  • non-cancerous

    plain medical equivalent; preferred when talking to patients

  • non-malignant

    technical; emphasises the contrast with malignant tumors

Antonyms
  • malignant

    the standard medical opposite — cancerous and likely to spread

  • cancerous

    everyday opposite

Usage Note

Distinguish from sense 2: this is the medical use, restricted to growths, tumors, lesions, cysts, or moles. Speakers often pair it with relief — 'turned out to be benign', 'thankfully benign'. The opposite is 'malignant', not 'harmful'.

Common Mistakes

The doctor said my cold is benign.
The doctor said my cold is mild.
'benign' in medicine refers to growths, not infections or symptoms.
The benign of the tumor was a relief.
The benign nature of the tumor was a relief.
'benign' is an adjective only; it cannot be used as a noun.

Word family

  • benignly
    adverbC2
  • benignity
    nounC2
  • benignant
    adjectiveC2

Synonym discussion

Sense: adjective/2

All four words describe something that is not threatening, but they sit at different points on a register and meaning scale. 'Harmless' is the everyday choice and works for any object, animal, or remark — 'a harmless joke', 'a harmless snake'. 'Benign' is more formal and is usually reserved for things that could plausibly cause harm but don't: a climate, a policy, a chemical, a tumor. 'Innocuous' overlaps with 'benign' but stresses surface appearance — something that looks or sounds dangerous yet turns out to be safe ('an innocuous-looking package'). 'Benevolent' shifts away from 'not harmful' toward 'actively kind and giving', so it fits people, organizations, and rulers ('a benevolent dictator', 'a benevolent uncle'). Compare: a chemical can be benign or innocuous but not benevolent; a foundation can be benevolent but not innocuous.

benign ↗harmless ↗innocuousbenevolent

Common collocations

Nouns

Adverbs

  • seemingly benign
  • apparently benign
  • completely benign
  • largely benign
  • thankfully benign

Phrases

  • turn out to be benign
  • a benign smile
  • benign neglect
  • seemingly benign update

Prepositions

  • benign to (someone/something)
  • benign in (its effect / nature)

Etymology

LatinOld FrenchMiddle EnglishModern English

Comes from Latin 'benignus', built from 'bene' meaning 'well' and a root linked to 'genus' meaning 'born' or 'kind' — so the literal idea was 'well-born', and from there 'kindly natured'. The word reached English in the 14th century through Old French 'benigne', first describing a person's gentle character. The medical use (a non-cancerous growth) is much later, growing out of the older sense that something benign would not turn nasty or do real harm.