The earliest known use of the English word "tidy" dates back to the 13th century. It was originally derived from the Proto-Germanic root word "tidis."
The most common use for tidy is as an adjective, generally meaning neat and orderly in appearance or function.
Furthermore, the word "tidy" can also be used informally to describe something that is either satisfactory or substantial.
As a verb, the word appears as tidying or tidied. An example of this would be: I am tidying up the house before our guests arrive.
The word is pluralized as "tidies" as a noun. It carries a different connotation. It can describe a container in which odds and ends are kept, or it can be a sort of decorative covering to protect the arms or headrest of a chair.
The word "tidily" adds to an already existing adjective when used as an adverb. An example of this type of use would be: She was tidily arranging her brushes and combs.