'Sanguin about' means 'very sure about' The word 'sanguin' means hopeful/confident/optimistic. Normally the meaning 'confident' is widely used for 'sanguin' .
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MahlonI'm not as nice as Mona. The use of "sanguine" in this sentence is simply wrong. The writer is probably trying to say that the diners are "indifferent" to the stains they acquire while eating. Being "cheerfully confident" about the stains simply does not work. This is an example of someone trying to use a word, the meaning of which they really do not unders