NSW Selective & Scholarship
Soporific
adjective/sop-uh-RIF-ik/
tending to induce drowsiness or sleep.
In contextThe professor's monotone lecture had a soporific effect on the class.
Remember it
SOPOR (deep sleep) + -FIC (making): soporific things manufacture sleep, like a droning lecture.
Use it well
Use for things that make you drowsy: a soporific voice, heat or lecture — witty in reviews; not just 'boring'.