soporific
C2CEFR level
65/100Rarity: rare
FormalRegister
Tending to induce drowsiness or sleep; sleep-inducing.
The speaker's soporific monotone had half the audience nodding off.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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