The story
Apparently a corruption of hallowedly, equivalent to hallow + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.
hallowly
Today it means: In a sacred, hallowed, or solemn manner; solemnly; sacredly. Full definition →
Today it means: In a sacred, hallowed, or solemn manner; solemnly; sacredly. Full definition →
Apparently a corruption of hallowedly, equivalent to hallow + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.