彼(かれ)は予期(よき)せぬ批判(ひはん)にも落(お)ち着(つ)きを保(たも)った。

He maintained his composure even in the face of unexpected criticism.

議論(ぎろん)が紛糾(ふんきゅう)しても、彼女(かのじょ)は落(お)ち着(つ)きを失(うしな)わなかった。

Even when the discussion became heated, she did not lose her composure.