0 Old HSK word(s):
后悔莫及* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

后 queen, empress, sovereign / (simp. for 後) behind, rear, after
悔 repent, show remorse, regret
莫 do not, is not, can not / negative
及 extend / reach / come up to / and
Hsk Characters:
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual