musty

/ˈmʌsti/

//ˈmʌsti// adj

"musty" is a 5-letter English headword indexed on PlainSpell.

The verdict

“musty” is a moderately-common English word, ranked #35,838 in English word frequency and used as an adjective.

#35,838
frequency rank, English
5
letters
8
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Affected by dampness or mould; damp, mildewed, mouldy.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

musty vs mute
60% similar
musty vs mutt
60% similar
musty vs MST
0% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for musty
PropertyValue
Headwordmusty
LanguageEnglish
Part of speechAdjective
IPA/ˈmʌsti/
Letters5
Frequency rank#35,838
Misspellings tracked8
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “musty” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). musty lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for musty is 5 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˈmʌsti/. Corpus data places it at rank #35,838 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 8 likely wrong-spelling variants for musty, with forms such as "mmusty", "msuty", and "mussty". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 20 confusable-pair relationships, "mute", "mutt", "MST", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: The adjective is derived from Late Middle English musty; further origin uncertain, possibly from one of the following: * From Anglo-Norman muste, moste, variants of moiste, muiste (“moist”), from Old French moiste (“clammy, damp, moist, wet”) (modern French… The correct English form is musty, spelled M-U-S-T-Y.

Definition

  1. 1
    Affected by dampness or mould; damp, mildewed, mouldy.
  2. 2
    Having an odour or taste of mould; also (generally), having a stale or unfresh odour or taste.
  3. 3
    Characteristic of or relating to mould or mouldiness.
  4. 4
    Of attitudes, ideas, writing, or other abstract things: no longer fresh or interesting; outdated, stale.
  5. 5
    Of a person: boring and unadventurous; also, old-fashioned, stuck in the past.
  6. 6
    Bad-tempered, grumpy, irritable.

Etymology

The adjective is derived from Late Middle English musty; further origin uncertain, possibly from one of the following: * From Anglo-Norman muste, moste, variants of moiste, muiste (“moist”), from Old French moiste (“clammy, damp, moist, wet”) (modern French moite (“muggy; sticky, sweaty”)), from a blend of Vulgar Latin *mucidus (from Latin mūcidus (“mouldy, musty”), from Old Latin mūceō (“to be mouldy or musty”) + -idus (suffix meaning ‘tending to’, forming adjectives)) + Latin mustum (“unfermented or partially fermented grape juice, must; new wine”) (from mustus (“fresh; young; unfermented”), from Proto-Indo-European *mus-, *mews- (“damp; moss”)). * From another language derived from the above Latin words (compare the cognates below). * A variant of Middle English mosty, moisti (“damp, humid, wet, moisty; of fruit: moist and juicy”) [and other forms] (perhaps influenced by must (“fruit (usually grape) juice which has been or will be fermented”)), from moist, moiste (“damp, humid; moist, wet; well-irrigated, well-watered; liquid; of ale: new; (figuratively) not withered, fresh; carnal, lascivious; raw, undisciplined”) (from Old French moiste: see above) + -i (suffix forming adjectives). Compare Middle French moisi (“mouldy”), an adjective use of the past participle of moisir (“(to cause) to go mouldy, to moulder”) (modern French moisir), from Latin mūcēre, the present active infinitive of Old Latin mūceō (“to be mouldy or musty”): see above. The English word is analysable as must (“mould; mustiness”) + -y (suffix meaning ‘having the quality of’ forming adjectives); however, must is thought to be a back-formation from musty. The noun and verb are derived from the adjective. Cognates * Catalan mústic, musti (“wilted, withered; gloomy, sad”) * Galician murcho, mucho (“wilted, withered”) * Old Occitan moste (Occitan moste, mosti, musti (“damp, wet”) (Gascon)) * Portuguese murcho (“wilted, withered; gloomy, sad”) * Spanish mustio (“wilted, withered; gloomy, sad”)

This word in other languages

Common misspellings

Also misspelled as: mmusty,msuty,mussty,mustty,mustyy,musyt,mutsy,umsty

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of musty - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

mmusty1msuty2mussty1mustty1mustyy1musyt2mutsy2umsty2
Edit distance from "musty"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "musty"?
"musty" is spelled M-U-S-T-Y. The IPA pronunciation is /ˈmʌsti/.
What does "musty" mean?
As an adjective, "musty" means: Affected by dampness or mould; damp, mildewed, mouldy.
What words are commonly confused with "musty"?
"musty" is commonly confused with "mute", "mutt", "MST". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "musty"?
The IPA (International Phonetic Alphabet) transcription for "musty" is /ˈmʌsti/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "musty"?
The adjective is derived from Late Middle English musty; further origin uncertain, possibly from one of the following: * From Anglo-Norman muste, moste, variants of moiste, muiste (“moist”), from Old French moiste (“clammy, damp, moist, wet”) (mod... See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “musty”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is M-U-S-T-Y - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈmʌsti/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “mute” - see the side-by-side comparison. musty vs mute
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list