Please add more synonyms
Completely = fuldstændig
Why not fulstændige?
Because it is an adverb.
Why not hele? Why is helt used?
Someone else should confirm this, but my read is that it is because helt is an adverb modifying hvide, rather than an advective modifying tage. A tricky one, I got it wrong.
Why helt and not fuldstændig?
Fuldstændigt works as well.
I used it and was told my answer was incorrect.
Hvide sounds like the typical mocking children do sticking their tongues out