Dangerous

//ˈdeɪn.ʒ(ə.)ɹəs// adj, slang

adj, slang ·Common ·High school level

Definitions

Adjective
  1. 1
    Full of danger.

    "Railway crossings without gates are highly dangerous."

  2. 2
    Causing danger; ready to do harm or injury.

    "If they incline to think you dangerous, / They have their knaviſh Arts to make you ſo."

  3. 3
    In a condition of danger, as from illness; threatened with death. colloquial, dated
Adjective
  1. 1
    causing fear or anxiety by threatening great harm wordnet
  2. 2
    involving or causing danger or risk; liable to hurt or harm wordnet

Synonyms

All synonyms
hazardousperilousriskytreacherousunsafedicey

Example

More examples

"You're stepping into dangerous territory."

Etymology

From Middle English dangerous (“difficult, severe, domineering, arrogant, fraught with danger”), daungerous, from Anglo-Norman [Term?], from Old French dangereus (“threatening, difficult”), from dangier. Equivalent to danger + -ous. Displaced native Old English frēcne.

Related phrases

Dangerous Cornera little knowledge is a dangerous thinga little learning is a dangerous thingarmed and dangerousdangerous goods

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.