What this suffix does
-blooded forms compound adjectives with two related groups of meaning. The biological group describes an organism's relationship to temperature: warm-blooded and cold-blooded describe whether animals regulate their own body temperature. The figurative group — and the most literary — describes temperament and passion: hot-blooded (passionate and impulsive), cold-blooded (calculating and without emotion), full-blooded (complete and vigorous), red-blooded (energetic and virile). These figurative uses are deeply embedded in English idiom and literary tradition.