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Webster 1828 Edition

, adv.

Religiously; with due reverence as of something holy or consecrated to God; as, to observe the sabbath sacredly; the day is sacredly kept.

Inviolably; strictly; as, to observe one's word sacredly; a secret to be sacredly kept.

sacredly ‎(comparative more sacredly, superlative most sacredly)

In a sacred manner.
- 1946, Mervyn Peake, Titus Groan
  Satisfaction because the ritual of Gormenghast was proceeding as sacredly and deliberately as ever before […]

in a sacred manner