(a.) Not susceptible of excitement; dull; lifeless; torpid.

affectless anesthetized apathetic arctic arid ataractic autistic aweless barren blah blank blase bloodless blunt bovine calm careless casual catatonic characterless chill chilly cold cold as charity cold-blooded coldhearted colorless composed cool coolheaded dead devil-may-care disinterested dismal dispassionate disregardful draggy drearisome dreary drugged dry dryasdust dull dusty easygoing effete elephantine emotionally dead emotionless empty etiolated even-tempered expected expecting fade flat frigid frosted frosty frozen heartless heavy heedless ho-hum hollow icy immovable impassible impassive imperturbable inane inattentive incurious inirritable insipid insouciant insusceptible jejune lackadaisical leaden lifeless listless low-spirited mindless negligent nerveless nonchalant nonemotional objective obtuse out of touch pale pallid passionless patient pedestrian perfunctory plodding pococurante pointless poky ponderous reckless regardless relaxed rock-steady self-absorbed slow solemn soulless spiritless steady steady-handed steady-nerved steel-nerved sterile stiff stodgy stoic stolid strong-nerved stuffy superficial tasteless tedious turned-off unaffectionate unamazed unanxious unastonished unastounded unawed unbewildered unblenching unblinking unconcerned undazed undazzled undiscriminating undisturbable undumbfounded unemotional unfaltering unfeeling unflappable unflinching unimpassioned unimpressed unimpressionable uninterested unirritable unlively unloving unmarveling unmindful unmoved unnervous unpassionate unquivering unresponding unresponsive unshaken unshaky unshrinking unsolicitous unstrained unsurprised unsusceptible unsympathetic untouchable untremulous unwavering unwondering vapid without a tremor wonderless wooden