tangential

Basically, Trump's thinking has become so tangential that he's really not able to answer a question in a way that's responsive to the question being asked.

“There’s a tangential connection there, but I don’t know the exact story,” McLeod caveats.

What makes it all work is that the scientific commentary is tangential.

Trump’s meandering replies consisted of the usual grab-bag of tangential anecdotes and endless grievances, his interviewer repeatedly forced to keep him on track by reminding him of the topic he was supposed to be discussing.

His meandering public speeches have, in recent months, grown longer, more tangential, and darker in tone.