narcotic

Adjective

• inducing mental lethargy
  • a narcotic speech
    

• inducing stupor or narcosis
  • narcotic drugs
    

• of or relating to or designating narcotics
  • narcotic addicts
    
  • narcotic stupor
    

Noun

• a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction

Related words

• Synonyms: 
  soporiferous , soporific , narcotizing , narcotising