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The room was untidy, with clothes scattered across the floor and books piled haphazardly on the desk.
Her room is untidy.
The house was a mess, which means it was untidy.
the prefix word is untidy!
Untidy is an adjective, so you'll use it to describe a noun.
For example:
"Your room is so untidy! Clean it up now!"
The park was very untidy, trash was everywhere.
The word "untidy" is an adjective.