晦 - dark, disappear

New Year's Eve

to conceal (oneself); to hide; to abscond

propensity to efface oneself; being prone to conceal one's talent

concealing one's talents, position, status, intentions, etc.

darkness

last and first days of the month

ambiguous; obscure; equivocal

concealing one's talents, status, intentions, etc.; maintaining a strict incognito; self-effacement

the last day of the year; New Year's Eve

the world is covered in darkness; all is plunged into darkness