Definitions of negative:

• noun:   a piece of photographic film showing an image with black and white tones reversed
• noun:   a reply of denial

  Example: "He answered in the negative"

• verb:   vote against; refuse to endorse; refuse to assent
• adjective:   characterized by or displaying negation or denial or opposition or resistance; having no positive features

  Example: "A negative outlook on life"

• adjective:   less than zero

  Example: "A negative number"

• adjective:   not indicating the presence of microorganisms or disease or a specific condition

  Example: "The HIV test was negative"

• adjective:   having a negative electric charge

  Example: "Electrons are negative"

• adjective:   expressing or consisting of a negation or refusal or denial
• adjective:   reckoned in a direction opposite to that regarded as positive
• adjective:   having the quality of something harmful or unpleasant

  Example: "Ran a negative campaign"

• adjective:   involving disadvantage or harm

  Example: "Minus (or negative) factors"

• adjective:   designed or tending to discredit, especially without positive or helpful suggestions

  Example: "Negative criticism"