The English term "morose, sullen, fretful, straightforward, simple" matches the Dutch term "aalwaardig"

other english words that include "fretful" : dutch :
fretful, morose, sullen, straightforward, simple aalwarig
fretful, morose, sullen gemelijk
other english words that include "straightforward" : dutch :
fretful, morose, sullen, straightforward, simple aalwarig
simple, straightforward eenvoudig