"Wasz syn będzie czuć się źle."

Translation: Your son will be feeling bad.

[JoannaKilanska]

"Wasz syn będzie się źle czuł." - it is much more natural in Polish.

[Oliwia307393]

Its supposed to be " Wasz syn będzie czuł się źle"

[Jellei]

"czuć się" or "czuł się" - they're equally good here.

[DMR680865]

Why not: Your son will be feeling unwell?

[deactivated user]

How can one anticipate when someone will be feeling bad at a particular point? Or is this like the colloquial meaning in English (He must be feeling bad because he's done something wrong)?

In either case a little context would be helpful:
"Your son will be feeling bad because he broke your favourite cup."
Or
"Your son will be feeling bad tomorrow after eating that soup."

Besides, a more natural wording in English might be "Your son won't be feeling well", but again it depends on context.

[Mobabrm]

To me it sounds like a curse or a threat. "You dare fire me? Your son won't be feeling so good soon...."

[BenYoung84]

It's easy, e.g. On Saturday it will be raining all day so your son will be feeling bad.

[AndrewWawr1]

It is much more natural in English to write 'your son will not be feeling well' but I guess you'd write this differently in Polish

[Okcydent]

Corresponding sentence would be: „twój/wasz syn nie będzie się czuł/czuć dobrze”

[1917koba]

How can we tell if it is bad or mad or evil?

[Jellei]

Well, "zły" (the adjective) can mean all of those, but I can't think of a situation when I could interpret the adverb "źle" as either 'mad' or 'evil'. Just 'bad', 'unwell'. He will either feel physically bad or mentally bad.

[PremGopalG]

So how would you say 'your son will feel bad'?

[BenYoung84]

The same Polish sentence works for that.