
unwohl
unwell
To feel physically not well, slightly ill, or nauseous.
Nach dem fettigen Essen war mir den ganzen Abend unwohl.
After the greasy food, I felt unwell all evening.
unwell / uncomfortable
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unwell
To feel physically not well, slightly ill, or nauseous.
Nach dem fettigen Essen war mir den ganzen Abend unwohl.
After the greasy food, I felt unwell all evening.

uncomfortable
To feel psychologically or socially uneasy, insecure, or embarrassed in a particular situation.
Ich fühle mich in großen Menschenmengen immer etwas unwohl.
I always feel somewhat uncomfortable in large crowds.
The word is the direct opposite of 'wohl' (well). The prefix 'un-' negates the adjective 'wohl' (good, healthy), so 'unwohl' (unwell/uncomfortable) literally means 'not good' or 'not healthy'.
Er fühlte sich nach der langen Reise sichtlich unwohl.
He visibly felt unwell after the long journey.
'Unwohl' (unwell/uncomfortable) is almost always used in two fixed constructions. Either with the verb 'fühlen' (to feel): 'Ich fühle mich unwohl' (I feel unwell/uncomfortable), or with 'sein' (to be), where the person is in the dative: 'Mir ist unwohl' (I feel unwell).
Ich fühle mich bei diesem Thema unwohl.
I feel uncomfortable with this topic.
The context tells you whether physical or psychological discomfort is meant. If it is about food, illness, or the body, the physical meaning is intended. If it is about social situations, conversations, or feelings, the psychological meaning is intended.
Vom Geruch des Fisches wurde mir unwohl.
The smell of the fish made me feel unwell.
bad
Schlecht and unwohl can both express physical discomfort. In the expression „jemandem ist schlecht“ (someone feels sick), schlecht typically indicates nausea. Unwohl is more general and also fits a mild, unspecified feeling of physical discomfort.

Nach der langen Busfahrt fühlte ich mich unwohl und schwach.
After the long bus ride, I felt unwell and weak.
Nach der kurvigen Busfahrt war mir schlecht.
I felt sick after the winding bus ride.