Godan verb with 'su' ending, Transitive verb
to inquire (about); to enquire; to ask
花子は不信に思って本当かどうか問いただした。Hanako questioned his sincerity. to interrogate; to question intensely; to grill (someone about something); to ask (someone) to explain
Also written 問い質す【といただす】、問い正す【といただす】、問い糾す【といただす】、問い糺す【といただす】