Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun soporific

1 sense of soporific

Sense 1
soporific, hypnotic -- (a drug that induces sleep)
       => drug -- (a substance that is used as a medicine or narcotic)
       => hypnagogue -- (an agent that induces drowsiness or sleep)

Antonyms of adj soporific

2 senses of soporific

Sense 1
soporific, soporiferous, somniferous, somnific, hypnogogic, hypnagogic -- (sleep inducing)

INDIRECT (VIA depressant) -> stimulative -- (capable of arousing or accelerating physiological or psychological activity or response by a chemical agent)

Sense 2
narcotic, soporiferous, soporific -- (inducing mental lethargy; "a narcotic speech")

INDIRECT (VIA uninteresting) -> interesting -- (arousing or holding the attention)

Similarity of adj soporific

2 senses of soporific

Sense 1
soporific, soporiferous, somniferous, somnific, hypnogogic, hypnagogic -- (sleep inducing)
       => depressant (vs. stimulative) -- (capable of depressing physiological or psychological activity or response by a chemical agent)

Sense 2
narcotic, soporiferous, soporific -- (inducing mental lethargy; "a narcotic speech")
       => uninteresting (vs. interesting) -- (arousing no interest or attention or curiosity or excitement; "a very uninteresting account of her trip")