(a.) Not susceptible; not capable of being moved, affected, or impressed; that can not feel, receive, or admit; as, a limb insusceptible of pain; a heart insusceptible of pity; a mind insusceptible to flattery.

affectless anesthetized arctic autistic blunt catatonic chill chilly cold cold as charity cold-blooded coldhearted cool dispassionate drugged dull emotionally dead emotionless frigid frosted frosty frozen heartless icy immovable impassible impassive inexcitable insensitive insentient nonemotional objective obtuse out of touch passionless self-absorbed soulless spiritless unaffectionate unemotional unfeeling unimpassioned unimpressible unimpressionable unloving unpassionate unresponding unresponsive unsusceptible unsympathetic untouchable