Other forms: negatives; negatived; negativing
Negative means focused on what is bad or lacking. A negative ad tells you bad things about the competition. A negative person loves to complain.
In math, a negative number is less than zero. People who see the glass half empty have a negative outlook. Ask your mom for ice cream and receive an answer in the negative? Don't be too negative back to her, or it'll be a while before you have another chance at ice cream.
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