Pococurante (5 syl.)
.Insouciant, devil-may-care, easy-go-lucky. As the “Pococurante Guardsman” (the imperturbable and impassive …). Also used for one who in argument leaves the main gist and rides off on some minor and indifferent point.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.