This is the 812th most frequent Dutch word.
behoorlijk
Fairly, quite, or properly.
In this sentence, 'behoorlijk' is used as an adverb to indicate a considerable degree or extent.
Het huis is behoorlijk groot.
The house is quite large.
Here, 'behoorlijk' emphasizes the extent of an attribute—in this case, rudeness.
Ik vond zijn gedrag behoorlijk onbeschoft.
I found his behavior quite rude.
In this sentence, 'behoorlijk' modifies the manner of action to showcase adequacy or appropriateness in timing.