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copacetic

or co·pa·set·ic, co·pe·set·ic

[koh-puh-set-ik, -see-tik]
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adjective Slang.
  1. fine; completely satisfactory; OK.

Origin of copacetic

1915–20, Americanism; of obscure origin; popular attributions of the word to Louisiana French, Italian, Hebrew, etc., lack supporting evidence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for copacetic

copacetic

copasetic, copesetic or copesettic

adjective
  1. US and Canadian slang very good; excellent; completely satisfactory

Word Origin

C20: of unknown origin
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

Word Origin and History for copacetic

adj.

1919, but it may have origins in 19c. U.S. Southern black speech. Origin unknown, suspects include Latin, Yiddish (e.g. Hebrew kol b'seder), Italian, Louisiana French (coupe-sétique), and Native American. None is considered convincing by linguists.

Online Etymology Dictionary, © 2010 Douglas Harper