De or het irrationalisme?

The correct Dutch article is:

het irrationalisme

Rule Words ending in -isme: almost always het. See the rule
Meaning (Dutch) het zich niet rationeel gedragen

How to use irrationalisme

the irrationalismehet irrationalisme
this irrationalismedit irrationalisme
that irrationalismedat irrationalisme
our irrationalismeons irrationalisme
your irrationalismejouw irrationalisme
every irrationalismeelk irrationalisme
which irrationalisme?welk irrationalisme?
a big irrationalisme / the big irrationalismeeen groot irrationalisme, het grote irrationalisme

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).