De or het postmodernist?

The correct Dutch article is:

de postmodernist

Rule Words ending in -ist: almost always de. See the rule

How to use postmodernist

the postmodernistde postmodernist
this postmodernistdeze postmodernist
that postmodernistdie postmodernist
our postmodernistonze postmodernist
your postmodernistjouw postmodernist
every postmodernistelke postmodernist
which postmodernist?welke postmodernist?
a big postmodernist / the big postmodernisteen grote postmodernist, de grote postmodernist