"Idle speculation" refers to the act of thinking or talking about something without any real purpose or evidence. It involves making guesses or assumptions without any solid basis.
Sentences with «idle speculation»
The existence of these parallel worlds is not just idle speculation. (newscientist.com)
No offence but just idle speculation by the media. (justarsenal.com)
This isn't mere idle speculation — ETF closures are reaching epidemic proportions south of the border. (canadiancapitalist.com)