narcotic
adjective
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inducing mental lethargy“The candidate gave a narcotic speech.”soporiferoussoporific
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inducing stupor or narcosis“Narcotic drugs are used by many members of society.”narcotizingnarcotising
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of, relating to, or designating narcotics“The narcotic addicts were arrested by the police.”
noun
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a drug that produces numbness or stupor“There was a pile of narcotics on the table.”