This is the 1323rd most frequent Dutch word.
minst
Least.
In this sentence, 'minst' is used as a superlative adjective meaning 'least' to describe the smallest degree of the quality 'experienced'.
Hij is de minst ervaren persoon in het team.
He is the least experienced person in the team.
Here, 'minst' is used adverbially as part of the superlative form to express the minimal degree to which something is liked.
Dat is wat ik het minst leuk vind.
That is what I like the least.
In this context, 'minst' functions as a comparative adjective in the superlative form to denote the minimal extent of a negative quality ('bad').