warmest-blooded

Adjective

warm-blooded (comparative more warm-blooded or warmer-blooded, superlative most warm-blooded or warmest-blooded)

1. Maintaining a relatively constant and warm body temperature, regardless of the ambient temperature; endothermic.
   • The cold-blooded animals are all feeble breathers, and the most energetic breathers are the warmest-blooded. A mollusc, a fish, a frog, a quadruped, and a bird, represent the various stages of this correspondence.1858 October, [George Henry Lewes], “Animal Heat”, in Blackwood’s Edinburgh Magazine, volume LXXXIV, number DXVI, Edinburgh: William Blackwood & Sons, page 427, column 1
2. (idiomatic) Passionate.
   • Claire jumped from her chair and smiled the warmest-blooded smile that she could muster.2003, Adele Griffin, Witch Twins and Melody Malady, New York, N.Y.: Hyperion Books for Children, →ISBN, page 27