研究社 新和英中辞典

いまさら 今更

〈今になって〉 now; after such a long time [【形式ばった表現】 so long a time]

〈事ここに至っては〉 now that things have come to this pass

今更らしく

as if 《it》 were [was] something new

今更言うまでもないが…

It is hardly necessary to say [mention], but….

用例

今更仕方がない. It can't be helped now.｜Nothing can be done about it now. 今更のように[今更ながら]常識の必要を感じた. I felt all the more keenly the need for common sense.

JMdict

今更

読み方：いまさら

今さら とも書く

文法情報	（副詞、名詞）
対訳	now (after such a long time); at this late hour (i.e. it is too late for something)

斎藤和英大辞典

今更

読み方 いまさら

副詞

Now; at this time of day

用例

いまさら合わす顔が無い
I dare not show my face at this time of day.

今さら言っても始まらぬ
It is no use talking now.

いまさら言っても後のお祭りだ
It is too late to talk now
It is a day after the fair.

いまさら言うまでも無いが
It does not justify repetition, but...

いまさら返らぬことながら
though it is now beyond recall

いまさらのように驚いた
I was surprised at it as if it were something new.

彼の行動はいまさらではない
His conduct is of a piece with his general character.