mordant (adjective) mordant: sarcastic
Sinonime: dead*, deadpan,
dull,
empty, fish-eyed,
impassive, inexpressive,
inscrutable, lackluster, lusterless, nobody home, poker-faced,
stolid, straight-faced,
stupid, unexpressive,
vacant,
vacuous, wooden
Antonime: animated, demonstrative,
expressive