noun
Refers to everything or all matters, often used in set phrases like 万事休す (all is lost) or 万事順調 (everything is going well). Slightly formal/literary.
万事うまくいっている。
Everything is going well.
万事休すだ。
All is lost.
全て is the common everyday word for 'all' or 'everything'. 万事 is more formal and often used in fixed expressions.
Compound of 万 (ten thousand, myriad) and 事 (thing, matter). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning 'all things'.