改あらたまった

noun-modifying (irregular)

formal; ceremonious

Used prenominally to describe occasions, speech, or behavior that is stiff, proper, or official. Often implies a departure from casualness.

See also: 改まる

• 改あらたまった席せきでは、敬けい語ごを使つかわなければならない。

  At formal occasions, you must use polite language.

• 彼かれは改あらたまった口く調ちょうで話はなし始はじめた。

  He began to speak in a formal tone.