>>>>What's the opposite from the following sentence: "today is a bright sunny day"?
>>>
>>>!"today is a bright sunny day"
>>
>>I prefer the expanded version, but yes, that's it.
>
>But is that the negate of the sentence, not the opposite?

The sentence is a statement that something is. Opposite is that it is not, IMO.

BTW, this was a trick question once during the selection of candidates for a quiz. I got that one right back then.