Adjective soporiferous has 2 senses
  1. soporific, soporiferous, somniferous, somnific, hypnogogic, hypnagogic - sleep inducing
    Antonym: stimulative (indirect, via depressant)
  2. narcotic, soporiferous, soporific - inducing mental lethargy; "a narcotic speech"
    Antonym: interesting (indirect, via uninteresting)
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