'nonsensical talk' is correct and usable in written English.
You can use it when referring to speech that does not make sense and is gibberish. For example: "When I asked him to explain his decision, all I got was nonsensical talk."
"The only ones who wouldn't think that would be the nonsensical talking heads who are paid a lot of money and utter complete nonsense," Martelli said.
No wonder Monsanto has to resort to such nonsensical talking points.
Comedian Sid Cesar was well known for his nonsensical "double talk" routines, which had a similar aim.
The four members kept the fans in suspense by talking nonsensical stuff before finally making an official announcement.
Willow considers the women in the Wicca group to be nonsensical, later complaining to Buffy "Talk, all talk.
In the past, I'd feel an urgent need to fill silences with something, anything, even the most nonsensical, irrelevant, or superficial talk, but, in truth, silence provides a welcome break from the constant chatter.
My nether regions swelled up to grapefruit-like proportions and I degenerated into a state of dehydrated delirium, a sweat-bathed figure talking in nonsensical riddles and vomiting for a fortnight at my mum's house.
Over his eight-decade career, Mr. Corey, who is known as Professor Irwin Corey on the comedy circuit, has been billed as "The World's Foremost Authority," a reference to his trademark style of highfalutin double talk and long, nonsensical observations that typically start with "However...".
The entry for the controversial "Fight Club," meanwhile, describes the ending as "either mind-blowing or nonsensical, depending on who's talking".
