The phrase "wert quick" means to act or move quickly. The antonyms for this phrase would be words that mean slow or sluggish. Some of these antonyms include lethargic, sluggish, sluggishness, slowness, tardy, and apathetic. These words can be used to describe a person or an object that is not quick or fast in their movement or actions. For instance, if you want to describe a person who is very slow or not quick in his movements, you can use any of the antonyms listed above. Similarly, if you want to describe an object that is slow in its working or functioning, you can also use these antonyms.