This is the 3689th most frequent Dutch word.
slechtst
"Worst."
In this sentence, 'slechtste' is used as a superlative adjective to indicate the highest degree of the negative quality described by 'slecht' (bad), applied to 'film'.
Dit is de slechtste film die ik ooit heb gezien.
This is the worst movie I have ever seen.
Here, 'slechtst' modifies a participle 'geklede' to form a superlative descriptive phrase, focusing on the person characterized by the most undesirable style of dressing among others at the party.
Wie was de slechtst geklede persoon op het feest?
Who was the worst-dressed person at the party?
In this context, 'slechtst' is used to compare outcomes, denoting the worst-case scenario among the anticipated possibilities.