i-adjective
bitterly cold; piercing cold
Describes a deep, penetrating cold that seems to come from the bottom or core, often used for weather or a room that feels thoroughly chilled.
底寒い冬の朝、外に出るのがつらい。
On a bitterly cold winter morning, it's hard to go outside.
暖房をつけても部屋が底寒い。
Even with the heater on, the room feels piercingly cold.
Compound of 底 (そこ, 'bottom') + 寒い (さむい, 'cold'). The exact historical derivation is uncertain, but the word evokes a cold that feels as though it comes from the depths or the very bottom.