1. Sleep inducing
   - soporific, somniferous, somnific, hypnogogic, hypnagogic 
2. Inducing mental lethargy
   - narcotic, soporific

See also: depressant, uninteresting

• providential
• providentially
• providently
• provider
• province
• provincial
• provincial capital
• provincialism
• provincialist
• provinciality
• provincially
• proving ground
• provirus
• provision
• provisional
• Provisional IRA
• Provisional Irish Republican Army
• provisionally
• provisionary
• provisioner
• provisions
• proviso
• provisory
• provitamin
• provitamin A