sardonic

(sɑːʳdɒnɪk )

adjective [usually ADJECTIVE noun]

If you describe someone as sardonic, you mean their attitude to people or things is humorous but rather critical.

…a big, sardonic man, who intimidated his students. 

…a sardonic sense of humour. 

Synonyms: mocking, cynical, dry, bitter  More Synonyms of sardonic

sardonically (sɑːʳdɒnɪkli ) graded adverb [ADVERB with verb]

He grinned sardonically and bowed towards her. 

https://www.collinsdictionary.com/dictionary/english/sardonic