1958 Spectator 14 Nov. 641/2 Mr. Wechsler..got on his feet rampaging against ‘latrine prose’ and the tedious doctrine of ‘un-think’.

1961 Guardian 9 June 11/6 The undiscriminating unthink of the new middle class.

1974 P. Gore-Booth With Great Truth & Respect 421 And let us not talk of a ‘Lost Empire’; that is a piece of ‘unthink’ which implies that, if only we had been cleverer, Australia would still have been governed from London.

1623 W. Shakespeare & J. Fletcher Henry VIII ii. iv. 102 I do beseech You (gracious Madam) to vnthinke your speaking, And to say so no more. View more context for this quotation

1640 C. Harvey Confusion i One while I think, and then I am in pain To think how to unthink that thought again.

1675 J. Howe Living Temple i. iii. 109 That the same thing is not thought and unthought, resolved and unresolved a thousand times in a day.

1683 I. Walton Chalkhill's Thealma & Clearchus 537 Still the king burns, and still his working brain Plots and displots, thinks and unthinks again.

1708 O. Dykes Moral Reflexions Eng. Prov. 6 There's no unthinking a Misfortune, after it has befallen us for want of Precaution or Foresight.

1811 Henry & Isabella I. 6 They knew not how to think, and unthink so often that this world is, and is not a good place.

1818 Cobbett's Weekly Polit. Reg. 33 527 To imagine that gags..will induce the people to unthink their present thoughts and unfeel their present feelings!

1823 I. D'Israeli Curiosities of Lit. 2nd Ser. I. 11 Bayle stands among those masters of the human intellect who taught us to think, and also to unthink!

1894 J. R. Illingworth Personality iv. 91 There is no question of the inevitableness of this conclusion; we cannot avoid it, we cannot unthink it.