deadlily

It was deadlily dark in the wood, with a darkness more unbroken than the stillness which yet seemed part of it.

Secret Bread F. Tennyson Jesse

But she was deadlily learned and evil-instructed; and, now and again, when the mask dropped, men saw this, shuddered and almost drew back.

Under the Deodars Rudyard Kipling 1900

When at [a] short distance from him I saw that he was deadlily [_sic_] pale, and clothed in flowing garments of white.

Mathilda Mary Wollstonecraft Shelley 1824