Answer: sharptongue

AnswerCrossword Clue
SHARPTONGUE

Curmudgeon's trait

SHARPTONGUE

Critical manner of speaking

SHARPTONGUE

Sarcastic one's feature

SHARPTONGUE
Critic's feature
SHARPTONGUE
Brainiac's asset?
SHARPTONGUECritic's feature, often
SHARPTONGUESnip's feature