An individual characterized as "moody and difficult" over a long period of time would most likely be diagnosed as having persistent depressive disorder.

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Persistent depressive disorder, also known as dysthymia, is a type of depression that is characterized by a low mood and other depressive symptoms that persist for at least two years. Individuals with this disorder may be seen as "moody and difficult" due to their chronic sadness and negative outlook on life.

An Individual Characterized as "Moody and Difficult" Over a Long