an emotional response to something

a response to a stimulus

एक उत्तेजक पर प्रतिक्रिया

English Usage: The negative reaction of the body to the medication was concerning.

Hindi Usage: दवा के प्रति शरीर की नकारात्मक प्रतिक्रिया चिंता का विषय थी।

to respond or behave in a particular way

to act in response to something

किसी चीज़ के प्रति कार्रवाई करना

English Usage: The audience reacted negatively to the performance.

Hindi Usage: दर्शकों ने प्रदर्शन के प्रति नकारात्मक प्रतिक्रिया दी।