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undreamable
undreamable adj.
Brit. 
/(ˌ)ʌnˈdriːməbl/
, /(ˌ)ʌnˈdriːməbl/U.S. /ˌənˈdriməb(ə)l/
/ˌənˈdriməb(ə)l/ΚΠ
1851 W. Howitt Madam Dorrington of Dene II. x. 216 An event so undreamt of and undreamable.
1957 L. MacNeice Visitations 53 When the undreamable Dream comes clearer.
2011 Guardian 22 Feb. (Review section) 36 The darker moments buzzed with urgency amid passages of undreamable sweetness.
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