hyporeactive

adjective

hy·​po·​re·​ac·​tive ˌhī-pō-rē-ˈak-tiv 

: having or showing abnormally low sensitivity to stimuli

her patellar and Achilles reflexes were hyporeactive

—Andres Alcaraz et al.

a hyporeactive patient

hyporeactivity

-(ˌ)rē-ˌak-ˈtiv-ət-ē 

noun

plural hyporeactivities