Also, the melancholy and sanguine would be sort of opposites, as the choleric and phlegmatic, since they have opposite traits.
en.wikipedia.org Two of these temperaments, sanguine and choleric, shared a common trait: quickness of response (corresponding to heat), while the melancholic and phlegmatic shared the opposite, a longer response (coldness).
en.wikipedia.org It was traditionally held to be hot and excessively dry and ruled the choleric humor.
en.wikipedia.org Therefore, it was evident that the sanguine and choleric shared a common trait: quickness of response, while the melancholy and phlegmatic shared the opposite, a longer response.
en.wikipedia.org Its psychological equivalent holds people are either sanguine (social and happy, basically), choleric (egocentric and strong-willed), melancholic (focused and analytic) and phlegmatic (calm and thoughtful).
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