Answer: sharptongue

AnswerCrossword Clue
SHARPTONGUECurmudgeon's trait
SHARPTONGUECritical manner of speaking
SHARPTONGUESarcastic one's feature
SHARPTONGUECritic's feature
SHARPTONGUEBrainiac's asset?
SHARPTONGUECritic's feature, often
SHARPTONGUESnip's feature