How to Say "untidiness" in Spanish
The Spanish word for “untidiness” is “desorden” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
lack of neatness

Examples
Tienes que limpiar el desorden de tu habitación antes de salir.
You have to clean up the mess in your room before leaving.
Siempre hay un gran desorden en mi escritorio al final del día.
There is always a big mess on my desk at the end of the day.
Masculine Noun Rule
Even though many Spanish nouns ending in -n are feminine, 'desorden' is masculine. Always say 'el desorden' or 'un desorden'.
Confusing Noun and Adjective
Mistake: “Mi casa es muy desorden.”
Correction: Mi casa es un desorden (My house is a mess) OR Mi casa está desordenada (My house is messy). Remember 'desorden' is the noun (the mess itself).
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