Treacherous

//ˈtɹɛt͡ʃəɹəs// adj

adj ·Common ·High school level

Definitions

Adjective
  1. 1
    Exhibiting treachery.

    "I see the wife misused by her husband, I see the treacherous seducer of young women, / I mark the ranklings of jealousy and unrequited love attempted to be hid […]"

  2. 2
    Deceitful; inclined to betray.
  3. 3
    Unreliable; dangerous.

    "a treacherous mountain trail"

Adjective
  1. 1
    tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans wordnet
  2. 2
    dangerously unstable and unpredictable wordnet

Synonyms

All synonyms
dangeroustraitorousunfaithfuljudaslikeperfidioustraitorous

Example

More examples

"Treacherous fire, bring relief to my torment."

Etymology

From Old French trecheros, tricheros (“deceitful”), equivalent to treacher + -ous. See treacher.

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