phlegmatic
phlegmatic adj
ME < OFr < L. < Gk φλεγματκός < φλέγ-ειν, to burn, to blaze.
- Cool; calm; unperturbed; self-possessed; not easily aroused; [fig.] apparently dormant; temporarily inactive; [etymology play] deceptively calm; hiding intense heat and flames beneath an undisturbed exterior.