soporiferous

Adjective
  1. Sleep inducing (synset 302316867)
    similar to: depressant - capable of depressing physiological or psychological activity or response by a chemical agent
    same as: hypnagogic, hypnogogic, somniferous, somnific, soporific
  2. Inducing mental lethargy (synset 301349046)
    "a narcotic speech"
    similar to: uninteresting - arousing no interest or attention or curiosity or excitement
    same as: narcotic, soporific

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