unceremoniously

In an unceremonious manner, abruptly, without the due formalities.

Japanese Meaning

儀礼や形式を省略して、急に、唐突に / 正規の儀式や手続きを踏まずに、突発的に

When the company closed the branch, they unceremoniously dismissed the longtime staff with little notice.

会社が支店を閉鎖したとき、彼らは長年勤めていたスタッフを突如、形式的な手続きを踏まずに解雇した。

Sense（1）

In an unceremonious manner, abruptly, without the due formalities.

more unceremoniously

（ comparative ）

most unceremoniously

（ superlative ）