SA'CREDLY, adverb 1. Religiously; with due reverence as of something holy or consecrated to God; as, to observe the sabbath sacredly; the day is sacredly kept. 2. Inviolably; strictly; as, to observe one's word sacredly; a secret to be sacredly kept.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI