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Adjective: soporiferous  ,só-pu'ri-fu-rus
  1. Sleep inducing
    - soporific, somniferous, somnific, hypnogogic, hypnagogic
     
  2. Inducing mental lethargy
    "a soporiferous speech";
    - narcotic, soporific

See also: depressant, meh [informal], uninspiring, uninteresting

Nearest

sophomore
sophomore class
sophomoric
Sophonias
Sophora
Sophora japonica
Sophora secundiflora
Sophora sinensis
Sophora tetraptera
sopor
soporiferous
soporific
soporifically
sopper
soppily
soppiness
sopping
soppy
sopranino
soprano
soprano clef