"Barna oppførte seg dårlig."

Translation: The children behaved badly.

[xoflram]

Why is dårlig not plural (darlige)?

[Deliciae]

"Dårlig" is functioning as an adverb here, not an adjective, so it does not decline.

[AndrBallon]

Du er snill Deliciæ

[UtkarshSyng]

Is dårlig not intense enough to mean terrible/terribly?

[Deliciae]

"Terrible/terribly" would be "fryktelig" or "forferdelig", which indeed have a stronger meaning.

[CommissarFeesh]

Connor, the app won't let me reply directly, but I think it's because you're describing the behaviour not the children.

[DouglasJulien]

I think it's because it's an adverb (so yes, describing the verb – behaving) and not an adjective (describing children).

[iyad.elbag]

I heard/wrote "barnet" (singular). Why is that wrong?

[Deliciae]

For listening exercises, only the sentence being read out will be accepted, which in this case uses "barna". I agree that the audio is a little ambiguous on this one though.

[Ondtogviltonsket]

Here could I use the phrasal verb 'act up' ?

[Deliciae]

Yes, that's a good fit.

[DanielAlla828604]

Children behaving badly? NEVER!!!!