What is the best synonym for "stun" based on the vocabulary provided?

The term "stun" implies rendering someone temporarily unable to think or react due to shock or surprise. The synonym "stupefy" captures this meaning perfectly, as it refers to the act of making someone unable to think or react normally—essentially, it conveys a sense of being overwhelmed or astonished to the point of disbelief. This aligns closely with the effects of being "stunned," which involves a similar state of shock.

The other options do not convey the intended meaning of "stun." "Surfeit" refers to an excessive amount of something, which is unrelated to the concept of shock or surprise. "Timorous" describes a state of fearfulness or shyness, lacking the element of overwhelming astonishment. "Tawdry," on the other hand, means showy but cheap or of little value, which does not connect to the concept of stunning someone through amazement or shock. Thus, "stupefy" is the best choice as it directly relates to the notion of rendering someone speechless or incapacitated through surprise.