Definition of treasonous in US English:

treasonous

adjective

  • 1Involving or guilty of the crime of betraying one's country.

    ‘a treasonous act against the State’
    ‘he was accused of a treasonous conspiracy to topple the government’
    ‘they're branding dissenters as unpatriotic and treasonous’
    • ‘I have never committed a treasonous act against my king nor my country.’
    • ‘Hold anyone who has perpetrated this treasonous war accountable for their crimes.’
    • ‘The defendants were found guilty of committing treasonous acts.’
    • ‘The government also recommended making it a crime not to report knowledge of treasonous activities.’
    • ‘He submitted military plans to them, that could be construed as treasonous.’
    • ‘They rounded up those they suspected as potentially treasonous and deported them.’
    • ‘He was accused of a treasonous conspiracy to topple the government.’
    • ‘He was falsely accused of treasonous crimes that could have resulted in the death penalty.’
    • ‘His only obligation is to investigate the treasonous acts of political operatives.’
    • ‘There is already treasonous talk amongst the military.’
    1. 1.1 Involving or guilty of the betrayal of someone or something.
      ‘he never paid for his treasonous act against Valerie’
      ‘dropping out of school was considered downright treasonous’
      ‘it seems almost treasonous to criticize the film’
      • ‘Dropping out of public school was considered downright treasonous.’
      • ‘It seems almost treasonous to criticise the final film.’
      • ‘I believe I am acting quite kindly to you, ignoring your treasonous remarks against me!’
      • ‘It is almost treasonous to say so, but the club are not big enough to have four star turns up front.’

Pronunciation

treasonous

/ˈtrizənəs//ˈtrēzənəs/