warning

warning — adjective

1. Designed to alert people about possible danger or trouble so they can stay safe

1.adjectiveB1
Definition

Designed to alert people about possible danger or trouble so they can stay safe or take action.

Example

A warning siren sounded across the town before the typhoon arrived.

attributive use: warning + noun

Emre saw a warning sign near the cliff edge and decided to turn back.

collocation: warning sign

Common collocations
  • warning sign
  • warning light
  • warning signal
  • warning siren
  • warning flag
Synonyms
  • alerting

    suggests a more urgent, immediate call to action

  • cautionary

    more formal and advisory, often about a milder risk

Antonyms
  • reassuring

    opposite effect — warning causes concern, reassuring calms fears

Grammar Patterns

warning + noun

warning — noun

Word family

  • warn
    verbB1
  • forewarn
    verbC1
  • unwarned
    adjectiveC1

Synonym discussion

Sense: noun/1

A 'warning' is a broad term for any signal or message about possible danger or harm. An 'alert' is more urgent — it tells you something is happening right now (e.g., a tornado alert). A 'caution' is milder and more advisory, often about a lower-level risk (e.g., 'caution: wet floor'). An 'admonition' is formal and carries a moral tone, like a parent scolding a child. 'Notice' is neutral and usually about an official piece of information rather than danger. Example: 'The mayor issued a warning about flooding' (strong risk); 'The lifeguard posted a caution about strong currents' (milder); 'The principal's admonition about honesty came during assembly' (moral tone).

Common collocations

Phrases

  • without warning
  • advance warning
  • fair warning

Prepositions

Etymology

Proto-GermanicOld EnglishMiddle EnglishEnglish

The word 'warning' comes from the Old English verb 'warnian', which meant 'to take heed, to be on guard, or to give notice of danger.' The ending '-ing' was added to form a noun and an adjective. It is related to the German verb 'warnen' (to warn) and the Proto-Germanic root '*warnōną', which carried the idea of paying attention or being cautious.