(there is) no use in arguing; dialogue is useless

questions and answers; dialogue

hold a dialogue

discussion / dispute, argument / debate

discuss / to argue, to dispute / to debate

useless / unnecessary; needless / prohibited, no (...ing)

uselessness / needlessness / being prohibited

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend