1. in a rude or abrupt manner without proper respect or politeness
2. without ceremony or formality

Examples

• The security guard unceremoniously escorted the troublemaker out of the building.
• She was unceremoniously fired after twenty years with the company.
• The old furniture was unceremoniously dumped on the curb.
• He unceremoniously dropped his backpack on the floor and collapsed into a chair.
• The protesters were unceremoniously removed from the premises.
• The meeting ended unceremoniously when the power went out.
• They unceremoniously canceled the event without any explanation.