subvocalized

/S AH0 B V OW1 K AH0 L AY1 Z D/
verb
  1. 1

    To form (words or statements) in thought and express them inwardly without uttering them aloud.

adjective
  1. 1

    Expressed by speaking inwardly

Source: https://en.wiktionary.org/wiki/subvocalize, https://en.wiktionary.org/wiki/subvocalized