soporifero (bn):
saai(en) boring, not exciting or interesting.
(en) causing boredom or tiredness.
(en) boring, monotonous., langdradig(en) boring, monotonous., monotoon(en) boring, monotonous., slaapverwekkend(en) tending to induce sleep., soporatief(en) tending to induce sleep.
Via: Dbnary en WikiWoordenboeken
Via: Memodata.com