mor ‧ dant /ˈmɔːd ə nt $ ˈmɔːr-/ BrE AmE adjective
[ Date: 1400-1500 ; Language: French ; Origin: present participle of mordre 'to bite' , from Latin mordere ]
mordant wit/satire/humour formal unkind and insulting humour etc that is also funny SYN biting :
The play’s mordant comedy makes for compelling viewing.