Most frowsy; the superlative form meaning most musty, stuffy, or disheveled.
Superlative form of 'frowsy' (or 'frowzy'), created by adding the superlative suffix '-est' to the adjective base, following standard English comparative/superlative patterns.
Superlatives let us be dramatic and exaggerated—calling something 'the frowsiest' is a way of emphasizing extreme mustiness or untidiness with a slightly humorous tone that the word carries naturally.
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