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Soporific
01
催眠薬, 睡眠薬
a drug that induces sleep
soporific
01
催眠の, 眠気を引き起こす
causing one to become sleepy and mentally inactive
Example
The dim lighting and soft voices created a soporific atmosphere in the room.
The lecture was so soporific that several students struggled to stay awake.
The long, monotonous drive had a soporific quality, leading him to doze off at the wheel.