harmful, unpleasant, or not wanted [≠ positive]:
My drinking was starting to have a negative effect on my work.
the negative aspects of ageing
On the negative side, it will cost a lot.
considering only the bad qualities of a situation, person etc and not the good ones [≠ positive]:
not liking somebody/something
students with a negative attitude to school
They have a uniformly negative image of the police.
Jean rarely sounded so negative about her mother.
saying or meaning 'no'
He gave a negative answer without any explanation.
containing one of the words 'no', 'not', 'nothing', 'never' etc [≠ affirmative]
not showing any sign of the chemical or medical condition that was being looked for [≠ positive]:
The pregnancy test was negative.
A person can be recently infected by HIV and have a negative result.
a negative charge is carried by electrons [≠ positive]
less than zero [= minus; ≠ positive]:
a negative return on our investment (=a loss)
used in the names of blood types, meaning not having Rhesus factor [≠ positive]