unannounced
adjective C1- Not announced beforehand.
From the library
If Stapleton came into the succession, how could he explain the fact that he, the heir, had been living unannounced under another name so close to the property?
He drew back the bolt of his door, and almost directly an old lady entered, unannounced, carrying her shawl on her arm, and her bonnet in her hand.
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