outlandish

In the online competition for attention, people constantly seek attention with extreme and outlandish behavior.

But if you rewind to the start of this campaign, hopes of success under Postecoglou didn't seem too outlandish.

He notes that the demands were so outlandish that submitting "would have been ruinously expensive and completely impractical."

Or an outlandish dig at the referee appointed for the big match?

It is not an outlandish prediction to suggest that, if it comes, any peace in the US-China trade war could be brokered by Cook.