@contrex,
You don't have to stick just to one meaning of a word:
Sizzle can also be the quality of being exciting, hot and new. Fashion uses sizzle that way, so do Broadway reviewers, in the same way they use the word "pop" to mean 'something that makes something else stand out".
I like it as well to describe a mood or atmosphere.
Emily was the worst person in the world to invite to a party, she could take a room from sizzle to moribund in the space of three sentences.
Not much use for Fourth Graders, but still.... .
Joe(But, yes, I agreed, some words have no opposites.)Nation