The phrase "knocked dead" is a slang term that means to wow or impress someone. Its antonyms include bore, disappoint, underwhelm, fail, and bomb. When a performance falls flat, it doesn't knock anyone dead. Similarly, if a movie is dull, it can't be said to have knocked anyone dead. A speech that doesn't capture anyone's attention can't be described as having knocked them dead. Conversely, if a comedian makes the audience laugh uncontrollably, they have certainly knocked the audience dead. By understanding the antonyms of this common slang term, we gain a better understanding of what it means to knock someone dead.