1. Someone with a habitually sullen or gloomy expression
   - sourpuss, picklepuss, pouter

Type of: persona non grata, unwelcome person

• nonmonotonic
• nonmotile
• nonmoving
• nonmusical
• nonnative
• nonnatural
• nonnegative
• nonnomadic
• nonnormative
• nonobjective
• nonobligatory
• nonobservance
• nonobservant
• nonoccurrence
• nonopening
• nonoperational
• nonoscillatory
• nonparallel
• nonparametric
• nonparametric statistic
• nonparametric statistics
• nonparasitic
• nonpareil
• nonparticipant
• nonparticipation