adj.
      - consisting in or characterized by the absence rather than the presence of something. 
▸expressing or implying denial, disagreement, or refusal.
 ▸
[
often in combination]
 not having a specified substance or condition:
 HIV-negative.
  ▸Grammar  & Logic  stating that something is not the case. Contrasted with affirmative and interrogative.
 ▸
[as exclam.]
 (especially in a military context) no.
 - undesirable or unwelcome. 
▸pessimistic or discouraging.
 - (of a quantity) less than zero.
 - containing, producing, or denoting the kind of electric charge carried by electrons.
 - (of a photographic image) showing light and shade or colours reversed from those of the original.
 - Brit. relating to or denoting proposed legislation which will come into force after a specified period unless explicitly rejected in a parliamentary vote.
 
n.
  - a word or statement expressing denial, refusal, or negation. 
▸a bad or unwelcome quality or aspect.
 - a negative photographic image from which positive prints may be made.
 
v.
  - reject, veto, or contradict.
 - render ineffective; neutralize.
 
 
  Derivative
  
    - negatively adv.
  - negativeness n.
  - negativism n.
  - negativist n. & adj.
  - negativistic adj.
  - negativity n.
 
   
  Etymology
  ME: from late L. negativus, from negare (see negate).