swithe

Adverb

 * 1) speedily; promptly
 * 2) * c. 1360, (accredited), The Travels of Sir John Mandeville
 * "enm"
 * "enm"

- And he yede and opened the tomb, and there flew out an adder right hideous to see; the which as swithe flew about the city and the country, and soon after the city sank down.

Etymology
From.

Adverb

 * 1) very