sensitivity

(noun) (physiology) responsiveness to external stimuli; the faculty of sensation. Synonyms: sensitiveness, sensibility. Example: "Sensitivity to pain."

(noun) the ability to respond to physical stimuli or to register small physical amounts or differences. Synonyms: sensitiveness. Examples: "A galvanometer of extreme sensitivity." "The sensitiveness of mimosa leaves does not depend on a change of growth."

(noun) sensitivity to emotional feelings (of self and others). Synonyms: sensitiveness.

(noun) susceptibility to a pathogen. Synonyms: predisposition.

(noun) the ability to respond to affective changes in your interpersonal environment. Synonyms: sensitiveness.