Humour that is presented in a matter of fact way, as it weren't even an attempt to be funny, can be described as dry. And any sort of writing or information can be dry if it's overly factual in nature.
As far as I know, though, no one uses wet to describe obvious humour or information with lots of flourishes.
What would be the right word for the opposite of "dry" in these metaphorical senses?
Or, to ask another way, what one word would you place in these sentences:
His joke definitely wasn't dry, it was downright _____________!
I thought her lecture would be dry, but it was surprisingly ____________.
When was dry first used in this sense, and was wet ever used as it's opposite metaphor?
And if I dare ask a "why" question, is there a reason dry is used in this metaphorical sense without having pulled along the obvious antonym?