responsiveness; sensitivity; susceptibility
Describes the property of reacting readily to external stimuli, influences, or changes; can be used for physical, emotional, or technical contexts.
This material has high sensitivity to temperature changes.
His rich responsiveness supports his talent as an artist.
反応性 is more technical and often used in chemistry or physics for reactivity, whereas 感応性 can imply a broader, sometimes more subtle or sympathetic response.
Compound of 感応 (かんのう, 'response, reaction, sympathy') + 性 (せい, '-ity, -ness'). The exact historical derivation is uncertain, but the word follows a common pattern for forming abstract nouns denoting a property.