You can think of malaise as the feeling of not being at ease and not being able to say why. Nothing is sharp enough to point at: no pain with a name, no broken part, no single event. There is only a low, spread-out sense that things are off. Hold that picture on one person's body and mood, and you have one meaning; stretch the same picture over a town, an industry or a country, and you have the other.
From the word’s history
Malaise comes from French malaise, mal- (bad) plus aise (ease) — literally 'bad ease', which is the same idea English carries in the phrase ill at ease.
malaise 來自法文 malaise：mal-（壞的）加 aise（自在），字面就是「不自在」。英文裡意思最接近的說法是 ill at ease（渾身不對勁）。所以「說不出原因的不舒服」不是後來才長出來的，而是這個字本來的意思。
Wiktionary etymology supplied in packet (kaikki:3f6f69a190036ae4:859333393): From French malaise (ill ease), from mal- (bad, badly) + aise (ease). Compare ill at ease.
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