Dictionary.com
Thesaurus.com

unthink

American  
[uhn-thingk] / ʌnˈθɪŋk /

verb (used without object)

unthought, unthinking
  1. to end one's thought or reverse the process of thought.


verb (used with object)

unthought, unthinking
  1. to dispel from the mind.

    Unthink your thoughts.

unthink British  
/ ʌnˈθɪŋk /

verb

  1. to reverse one's opinion about

  2. to dispel from the mind

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of unthink

First recorded in 1590–1600; un- 2 + think 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“Colin told me one time that this is the way he went through life, that he liked to create things that people couldn’t unthink,” Dall told the Denver Post.

From Washington Post

“When I was studying art history, I was told to unthink that notion of the starving artist in the garret,” Gordenker says.

From New York Times

Now that she had thought it, she couldn’t unthink it.

From Literature

We cannot unthink the network; we can only think through and within it.

From The Guardian

But we need, says Harvard University’s Maya Jasanoff, who is prominent throughout the series, to “unthink the inevitability” of the power relations that calcified later.

From Washington Post