Mondayitis

From Monday +‎ -itis.

The term has been widely used in Australia for decades. Popularity of the term in the USA may be traceable to its use in the US comedy film Office Space (1999).

• Audio (US):

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Mondayitis (uncountable)

1. the tired and apathetic feeling experienced by persons returning to work on a Monday after the weekend

• Mondayish
• the Wikipedia article "Working time", which places the term in context