おそろしい
terrible, frightening
Whatever it was in the dream, it was still in the room when you woke and the light had to go on. The same oh おそ, sore ろし as 恐れる, except worse. Not startling: the other kind: おそろしい.
Shares 恐 with 恐怖 きょうふ, fear. 恐怖 is what you feel and 恐ろしい is what the thing is.
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