adjective dubtós , incert character, place equívoc , sospitós matter discutible in doubtful taste de gust dubtós he has a doubtful character té una mala reputació , té mala fama I am doubtful whether dubto si I was still doubtful about speaking to her no sabia encara si parlar-li he remained doubtful about it no n'estava segur to be doubtful of \ as to something dubtar d'alguna cosa doubtful result resultat incert of doubtful efficacy d'eficàcia incerta