Is my understanding of the word "malaise" correct?

Greetings to everyone on this platform. This is my sixth time posting to this website. Anyways, there is this word "malaise" I'm trying to figure out. It has three definitions, according to Merriam Webster.
Definition of malaise
1: an indefinite feeling of debility or lack of health often indicative of or accompanying the onset of an illness
An infected person will feel a general malaise.
2: a vague sense of mental or moral ill-being
a malaise of cynicism and despair
3: a problem or condition that harms or weakens a group, society, etc.
[noncount]
postwar malaise
[singular]
The country's current economic problems are symptoms of a deeper malaise.

The general premise of the first two meanings seems to refer to a slump in which you feel sick either mentally or physically. The last definition seems to refer to a slump that everyone collectively is plagued by, like an economic slump or education slump or a political slump.
Is my understanding of these definitions completely off the mark? Please correct my understanding, if there are any errors.