Senses
顽钝/ 頑鈍 stupid
(literary) stupid; thickheaded; dull-witted
顽钝/ 頑鈍 blunt
(literary) blunt or dull, especially referring to a blade or instrument
顽钝/ 頑鈍 shameless
(literary) lacking in moral courage; thick-skinned and without a sense of shame