The quality or state of being unkempt, musty, or having a stuffy, stale smell.
From frowzy (of uncertain origin, possibly from Middle English) plus the suffix -ness, which converts adjectives to abstract nouns. The word gained popularity in English by the 17th century to describe both physical neglect and musty odors in enclosed spaces.
Frowziness perfectly captures why Victorian literature so frequently complained about poorly ventilated rooms and unwashed clothes—it's a word born from a time when bathing was rare and indoor plumbing rarer still, making musty stuffiness a constant background character in everyday life.
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