This is the 5980th most frequent Dutch word.
quick
The Dutch word "kwiek" (not "quick") means "lively" or "energetic" in English.
Here, 'snel' is used as an adjective to describe the car, indicating its ability to move fast.
De auto is zeer snel.
The car is very quick.
Here, 'snelle' modifies 'beslissing' (decision) as an adjective, describing the decision's speed.
Hij maakte een snelle beslissing.
He made a quick decision.
Here, 'snel' modifies 'liep' (walked) as an adverb, specifying the speed of her action.