Adverse (adjective) ऐड्वर्स
विरुद्ध/ विपरीत/ प्रतिकूल
1) having a negative or harmful effect on something
e.g.
I had an adverse reaction to the medication.
The forecasters have predicated adverse weather for the next two days.
2) going against something, or causing harm
Government policies may have adverse effects on the economy.
Recent advertisement has had an adverse effect on sales.
Averse (adjective) अवर्स
विरुद्ध/ अनिच्छुक
strongly disliking or opposed to
e.g.
Few politicians are averse to appearing in debate on television.
Mr. Kumar is not averse to a large gathering.