Something or someone displeasing; anything that is disagreeable.
Causing repugnance; unpleasant to the feelings or senses; displeasing.
A denial or contradiction.
A proposition which is the contradictory of another proposition and which can be obtained from that other proposition by the appropriately placed addition/insertion of the word "not". (Or, in symbolic logic, by prepending that proposition with the symbol for the logical operator "not".)
The logical operation which obtains such (negated) propositions.
The act of negating something.