Definition of pertinaciously in English:

pertinaciously

adverb

formal
  • See pertinacious

    • ‘The Spanish Scholastics remain profoundly admired by Catholics as the great intellects they were - unthinkable if they had pertinaciously taught perverse error.’
    • ‘I remember that for years I pertinaciously read comic strips, unable to see what Americans saw in them.’

Pronunciation

pertinaciously

/ˌpəːtɪˈneɪʃəsli/