Sullen
Part of speech: adjective
Definition: having a brooding ill temper; sulky. dismal; somber. sluggish; slow.
Example sentence: It's really odd that I've got this kind of sullen reputation - I never saw myself that way.
Lowering
Part of speech: noun
Definition: The act of something being lowered.
Part of speech: adjective
Definition: That lowers or frowns.
Part of speech: verb
Definition: To frown; to look sullen.
Example sentence: The benefits of prison education go beyond lowering recidivism rates and increasing post-release employment. It can also rekindle a sense of purpose and confidence.