Definition of subvocal in English:

subvocal

adjective

Psychology Philosophy
  • Relating to or denoting an unarticulated level of speech comparable to thought.

    ‘almost all of what is called ‘thinking’ is subvocal talk’
    • ‘The sensor can even detect subvocal or silent speech.’
    • ‘It heightens subvocal speech or forces you to - very quickly - develop nonverbal communication of some subtlety.’

Pronunciation

subvocal

/sʌbˈvəʊk(ə)l/