te ‧ mer ‧ i ‧ ty /təˈmerəti, tɪˈmerəti/ BrE AmE noun [uncountable] formal
[ Date: 1400-1500 ; Language: Latin ; Origin: temeritas , from temere 'in the dark, too quickly and carelessly' ]
when someone says or does something in a way that shows a lack of respect for other people and is likely to offend them ⇨ audacity :
He actually had the temerity to tell her to lose weight.