The wrongly spelled word is "Sacrelegious." The correct spelling is "Sacrilegious." Sacrilegious means showing disrespect or irreverence towards something considered sacred or religious.

Explanation of the other options:

☀ Millennium: This word is spelled correctly. It refers to a period of one thousand years.

☀ Maneuver: This word is spelled correctly. It refers to a planned or skillful movement or action.

☀ Connoisseur: This word is spelled correctly. It refers to a person who has expert knowledge or keen appreciation in a particular field, often related to art, food, or wine.