Unceremonious (adjective)

Lack of ceremony or formality; not polite; abrupt or discourteous.

Origin:

From un- (not) + ceremonious (characterized by ceremony or formality).

Examples:

1. He was fired in an unceremonious manner.
2. The unceremonious announcement caught everyone off guard.
3. She was given an unceremonious send-off from the company.
4. The unceremonious way he spoke to her was unacceptable.
5. The unceremonious ending to the meeting left a bad taste in everyone's mouth.