Meaning of “negative” - Learner’s Dictionary

negative

adjective us uk /ˈneɡətɪv/
He made negative comments to the press.The report only homes in on the negative points.He felt very negative about the future.You'll never succeed with that negative attitude.Reviews of the play have been predominantly negative.
NO ENTHUSIASM

B1 not having enthusiasm or positive opinions about something:

negative feelings
Many people have a negative attitude towards ageing.
BAD

B2 A negative effect is bad and causes damage to something:

Terrorist threats have had a very negative impact on tourism.
MEDICINE

If the result of a test to prove if someone is pregnant or sick is negative, that person is not pregnant or sick.

NUMBERS

A negative number is less than zero.

GRAMMAR

A2 In language, a negative word or phrase expresses the meaning 'no' or 'not'.

(Definition of “negative adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)