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Somniferous describes something that induces sleep or makes a person feel sleepy, especially a substance, medicine, sound, or atmosphere with a sleep-inducing effect.
/sɒmˈnɪfərəs/ (UK), /sɑːmˈnɪfərəs/ (US)
Definition of Somniferous
Somniferous (adjective): causing or inducing sleep; sleep-producing or sleep-inducing.
The word is most commonly used in formal, literary, or scientific contexts. It can describe a drug or substance that causes sleep, but it can also describe anything figuratively dull or sleep-inducing, such as a speech, lecture, sound, or atmosphere.
Synonyms and Antonyms of Somniferous
Synonyms:
Antonyms:
- stimulating
- invigorating
- energizing
- wakeful
- alerting
Video of Somniferous
Somniferous in Context
The physician prescribed a somniferous medication to help the patient sleep after several nights of severe insomnia. Although the treatment was effective, she was advised to take it only as directed because of its strong sedative effects.
Not all somniferous experiences involve medication. The steady sound of rain against the window, combined with the warmth of the room and the dim evening light, created a remarkably somniferous atmosphere that made it difficult to stay awake.
The adjective can also be used figuratively to describe something excessively dull or monotonous. During the conference, the speaker’s long and somniferous presentation caused several members of the audience to struggle to remain attentive.
Parts of Speech of Somniferous
- Adverb: somniferously
Origin of Somniferous
Somniferous comes from Latin somnus, meaning “sleep,” combined with -ferous, meaning “bearing” or “producing.” Thus, its literal sense is essentially “sleep-producing” or “bringing sleep.”


