hyposensitivity
This term is primarily utilized in clinical, neurological, and psychological settings to describe a sensory processing deficit. It conveys a state of diminished responsiveness, where the threshold for triggering a reaction is significantly higher than normal. This creates a clinical atmosphere of detachment or numbness, contrasting with hypersensitivity, which implies an overreaction to stimuli.
As an uncountable noun, it refers to a general physiological or psychological condition rather than a discrete event. Because it is a mass noun, it cannot be pluralized to describe multiple instances of the condition; instead, practitioners use partitive constructions such as "a degree of hyposensitivity" or "levels of hyposensitivity" to quantify the state.