9 letters · 17 points in Scrabble
adjective completely satisfactory; ; - John O'Hara
originStephen Goranson says "there is good reason to think that Irving Bacheller invented the word [with the spelling copasetic] for a fictional character with a private vocabulary in his best-selling and later-serialized 1919 book about Abraham Lincoln in Illinois, A Man for the Ages", and its currency increased by use in the 1920 song "At the New Jump Steady Ball" (see quotation below).…
Etymology from Wiktionary, CC BY-SA 3.0