Something that is opposite or against something else.
विपरीत
English Usage: Her views were contrary to popular belief.
Hindi Usage: उनके विचार जनप्रिय विश्वास के विपरीत थे।
The contradiction or denial of something.
अस्वीकृति
English Usage: The negation of the proposal surprised everyone.
Hindi Usage: प्रस्ताव की अस्वीकृति ने सभी को चौंका दिया।
The act of saying that something is not true.
English Usage: A clear negation of his claims was necessary.
Hindi Usage: उसके दावों की स्पष्ट अस्वीकृति आवश्यक थी।
Opposing or different in nature.
English Usage: He has a contrary attitude towards change.
Hindi Usage: उसका परिवर्तन के प्रति विपरीत दृष्टिकोण है।