soporificadjective1 soporific drugs: sleep-inducing, sedative, somnolent,calmative, tranquilizing, narcotic, opiate; drowsy,sleepy, somniferous; Medicine hypnotic. ANTONYMSinvigorating.2 a soporific TV drama: boring, tedious, tired, dreary,turgid, dry, mind-numbing.nounshe was given a soporific: sleeping pill, sedative,calmative, tranquilizer, narcotic, opiate; Medicinehypnotic. ANTONYMS stimulant.
Soporific is not exactly an obscure word, but not one that gets thrown around in everyday conversation either. More the pity.