lack

Noun

• the state of needing something that is absent or unavailable
  • there is a serious lack of insight into the problem
    
  • water is the critical deficiency in desert regions
    
  • for want of a nail the shoe was lost
    

Verb

• be without
  • This soup lacks salt
    
  • There is something missing in my jewelry box!
    

Related words

• Synonyms: 
  deficiency , want , miss
• Antonyms: 
  have , feature