Mondayitisn.
/ˌmʌndeɪˈʌɪtᵻs/, /ˌmʌndɪˈʌɪtᵻs/, U.S. /ˌmənˌdeɪˈaɪdᵻs/, /ˌməndiˈaɪdᵻs/ colloquial and humorous.
Reluctance to attend school or work, or a reduction in working efficiency, experienced on a Monday morning.
ΚΠ
1908 Weekly Advocate (Victoria, Texas) 5 Sept. The shippers seem to have a very aggravated case of Mondayitis, as the big end of the receipts arrive on that day.
1925 Bull. High Points Oct. 11/1 All complained with such woe-begone faces that I have added two new names to the medical list of diseases: Mondayitis and Fridayitis.
1938 Penguin Parade No. 3. 253 (advt.) Frequent attacks of Lassitude, ‘Mondayitis’, Biliousness, Nausea, [etc.].
1962 Walkabout June 14/1 Since drovers have no week-end breaks, they are likely to suffer not ‘Mondayitis’, but ‘everydayitis’.
1989 Courier-Mail (Brisbane) 20 Nov. 29/4 It's Monday morning. It's Mondayitis time. It's when product (or service) quality often falls to its lowest point. It's when most industrial accidents happen.
1993 South China Morning Post (Hong Kong) (Nexis) 5 Sept. 13 Dr Vrijmoed said the ‘Monday blues’ syndrome or ‘Mondayitis’ was not a figment of the imagination.
2009 C. James Unreliable Mem. i. 29 I did everything to get out of facing up to Miss Turnbull. I had Mondayitis every day of the week.
This is a new entry (OED Third Edition, September 2002; most recently modified version published online March 2022).
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n.1908