Unthink vs Undream - What's the difference?

Undream is a hypernym of unthink.

is that unthink is to undo the process of thinking while undream is to dismiss from the imagination as though never dreamed.

(intransitive) To undo the process of thinking.

* 1993 , Henning F Harmuth, Information Theory Applied to Space-time Physics

We should have to unthink as far back as Aristotle...

* 2006 , Kirsten Shepherd-Barr, Science on Stage: From Doctor Faustus to Copenhagen

In An Experiment with an Air-Pump , characters repeatedly assert that "once you've thought something, you can't unthink it, can you?"

To dismiss from the imagination as though never dreamed.

* 1876 , Fanny Wheeler Hart, Miss Hitchcock's Wedding Dress

Dreams, whether waking or sleeping ones, continue part of us. We can't undream them. We are roused out of them, but they remain.

* 1880 , Theodore Dwight Weld, In Memory: Angelina Grimké Weld

This is all like a dream now; but I can't undream it, and I can't resist it. I must go.

* unthink

* unimagine

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