A sudden and widespread disaster or misfortune.

आपदा

English Usage: The earthquake was a catastrophic event that destroyed many buildings.

Hindi Usage: भूकंप एक आपदा थी जिसने कई इमारतों को नष्ट कर दिया।

The way in which one acts or conducts oneself, especially towards others.

व्यवहार

English Usage: His behaviour at the party was quite strange.

Hindi Usage: पार्टी में उसका व्यवहार थोड़ा अजीब था।

The reactions or responses of an individual or group to a stimulus or situation.

प्रतिक्रिया

English Usage: The behaviour of the crowd was aggressive during the protest.

Hindi Usage: विरोध के दौरान crowd की प्रतिक्रिया आक्रामक थी।

Involving or causing sudden great damage or suffering.

विनाशकारी

English Usage: The oil spill had catastrophic effects on marine life.

Hindi Usage: तेल रिसाव का समुद्री जीवन पर विनाशकारी प्रभाव पड़ा।