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unpremeditated

British  
/ ˌʌnprɪˈmɛdɪˌteɪtɪd /

adjective

  1. not planned beforehand; spontaneous

"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

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Unpremeditated, un-prē-med′i-tā-ted, adj. not planned beforehand, not previously thought of.—adj.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

Unpremeditated discoveries, like unpremeditated dissipations, are always the most successful.

From The Transgression of Andrew Vane a novel by Carryl, Guy Wetmore

Unpremeditated is graver and more formal, denoting absolute want of preparation, but is rather too heavy a word to be applied to such apt, ready utterance as is generally designated by impromptu.

From English Synonyms and Antonyms With Notes on the Correct Use of Prepositions by Fernald, James Champlin

Unpremeditated art it is not: indeed it is craft rather than art; for Art demands a larger share of soul-expenditure than Pulci could afford.

From Earthwork out of Tuscany Being Impressions and Translations of Maurice Hewlett by Hewlett, Maurice Henry

Unpremeditated outburst of enthusiasm meant as welcome back from Bradford, where he reviewed political situation with force and frankness that recalled his father's platform speeches delivered in his prime.

From Punch, or the London Charivari, Vol. 146, March 25, 1914 by Various