a.
Unfeeling, passionless, impassible, impassive, stoical, unimpressible, unsusceptible, insensible, senseless, soulless, phlegmatic, dull, obtuse, cold, sluggish, torpid, tame, lukewarm, indifferent, unconcerned, callous, dead, cold-blooded, without sensibility, destitute of feeling.