soporiferous

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sop·o·rif·er·ous

 (sŏp′ə-rĭf′ər-əs, sō′pə-)
adj.
Inducing or tending to induce sleep; soporific.

sop′o·rif′er·ous·ly adv.
sop′o·rif′er·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.soporiferous - sleep inducing
depressant - capable of depressing physiological or psychological activity or response by a chemical agent
2.soporiferous - inducing mental lethargy; "a narcotic speech"
uninteresting - arousing no interest or attention or curiosity or excitement; "a very uninteresting account of her trip"