げつよう月曜getsuyou
1.

The second day of the week, situated after Sunday and preceding Tuesday, often regarded as the start of a new work or school week.

2.

A phenomenon where individuals experience a lack of motivation or enthusiasm for their work or school responsibilities on Monday, often attributed to excess activities or relaxation during the preceding weekend.

Example:

国会は来週月曜に開かれる。

げつようび月曜日getsuyoubi
1.

The second day of the week, following Sunday, typically recognized as the first day of the work or school week in many cultures.

2.

A day commonly associated with the beginning of new tasks or responsibilities, often viewed as a fresh start following the weekend.

3.

A calendar day designated for various events and activities, often linked to conventional business hours and routines.

Example:

月曜日はいつも憂鬱だ。