Frowst is a word used to describe a warm, stuffy, and unpleasant environment. Its synonyms include musty, stale, and suffocating. Other synonyms include airless, stagnant, and unventilated, which gives the impression of something close, damp, or even moldy. The word can also be related to people, describing someone who is being stuffy or grumpy. Other synonyms for this usage include surly, churlish, or moody. Frowst most commonly describes a physical environment and can be applied to any space that lacks fresh air or circulation. It is generally a word with negative connotations and is not typically used to describe places or people positively.