Learn how to say Soporific correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word soporific:
tending to induce drowsiness or sleep:
the motion of the train had a somewhat soporific effect
sleepy or drowsy:
some medicine made her soporific
tediously boring or monotonous:
a libel trial is in large parts intensely soporific
a drug or other substance that induces drowsiness or sleep.
mid 17th century: from Latin sopor ‘sleep’ + -ific