This is the 3551st most frequent Dutch word.
oud
Old.
The word "Oude" functions as an attributive adjective to the noun 'gewoontes', describing them as having been long-standing or traditional.
Oude gewoontes zijn moeilijk af te leren.
Old habits are hard to unlearn.
The word "oude" here is an adjective describing the noun 'man', indicating his age.
Mijn opa is een heel oude man.
My grandfather is a very old man.
The word "oud" is used as an adjective describing the noun 'boek', pointing out its old state in terms of time.