Nouns

(n)negativea reply of denial“he answered in the negative”
(n)negativea piece of photographic film showing an image with light and shade or colors reversed

Verbs

(v)veto, blackball, negativevote against; refuse to endorse; refuse to assent“The President vetoed the bill”

Adjectives

(a)negativecharacterized by or displaying negation or denial or opposition or resistance; having no positive features“a negative outlook on life”, “a colorless negative personality”, “a negative evaluation”, “a negative reaction to an advertising campaign”
(a)negativeexpressing or consisting of a negation or refusal or denial
(s)negativehaving the quality of something harmful or unpleasant“ran a negative campaign”, “delinquents retarded by their negative outlook on life”
(a)negative, disconfirmingnot indicating the presence of microorganisms or disease or a specific condition“the HIV test was negative”
(a)negativereckoned in a direction opposite to that regarded as positive“negative interest rates”
(s)negativeless than zero“a negative number”
(s)damaging, negativedesigned or tending to discredit, especially without positive or helpful suggestions“negative criticism”
(s)negative, electronegative, negatively chargedhaving a negative charge“electrons are negative”
(s)minus, negativeinvolving disadvantage or harm“minus (or negative) factors”