source: Emi Yusa | Hataraku Maou-sama! Wiki | FANDOM powered by Wikia

connected with God (or the gods) or dedicated to a religious purpose and so deserving veneration:

(神にささげられ)神聖な, 聖なる; 〖名詞の前で〗宗教的な

e.g. sacred rites

e.g. the site at Eleusis is sacred to Demeter.

religious rather than secular:

e.g. sacred music.

(of writing or text) embodying the laws or doctrines of a religion:

e.g. a sacred Hindu text.

regarded with great respect and reverence by a particular religion, group, or individual:

｟かたく｠ 〈物･事が〉きわめて重要な; 厳粛で破ることのできない, 履行すべき; ｟しばしばおどけて｠ (他人には滑稽なくらい)大事な

e.g. an animal sacred to Mexican culture.

sacrosanct:

e.g. to a police officer nothing is sacred.

sacredly adverb

sacredness |ˈsākrədnəs| noun

late Middle English: past participle of archaic sacre‘consecrate’, from Old French sacrer, from Latin sacrare, from sacer, sacr- ‘holy’.