This is the 1554th most frequent Dutch word.
ergste
"Ergste" means "worst" in English.
'Ergste' is used here as a superlative adjective modifying 'deel', implying the most negative or undesirable part.
Het ergste deel van de film was het einde.
The worst part of the movie was the end.
Here, 'ergste' acts as a superlative to express the highest degree of undesirability among options.
Van alle weersomstandigheden vind ik regen het ergste.
Of all weather conditions, I find rain the worst.
'Ergste' is employed as a superlative describing 'wat', emphasizing the most negative action possible.