This is the 2843rd most frequent Japanese word.
いまさら
"いまさら" means "too late now" or "at this point (when it’s too late to matter)."
Here, 'いまさら' conveys the feeling of 'at this late stage' or 'after so much time has passed', indicating a point at which addressing the issue may not be appropriate.
いまさらそんなことを言われても困ります。
Even if you tell me something like that at this late stage, it's not helpful.
In this sentence, 'いまさら' expresses the notion of 'now, after the time to act has passed', emphasizing a sense of futility about the regret.
いまさら後悔しても、もう遅いです。
Even if you regret it now, it's already too late.
Here, 'いまさら' highlights the tardiness of realizing something, connoting surprise or incredulity regarding the time of realization.