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

See also: depressant, uninteresting

• trifoliated
• trifoliolate
• trifoliolate leaf
• Trifolium
• Trifolium alpinum
• Trifolium dubium
• Trifolium incarnatum
• Trifolium pratense
• Trifolium reflexum
• Trifolium repens
• Trifolium stoloniferum
• triforium
• triform
• trifurcate
• trifurcation
• trig
• Triga
• trigeminal
• trigeminal nerve
• trigeminal neuralgia
• trigeminus
• trigger
• trigger off
• trigger-happy
• triggerfish