On things that are past, it is needless to pursue past mistakes; let bygones be bygones.

compulsory, forcing, forced, coercive, forcible

philosopher

certain, inevitable, necessary

public profit corporation

(dated slang) a woman who is attractive from behind, usually in reference to her buttocks. / (dated slang, in particular) butterface: A woman who is attractive from behind but ugly from the front.

hostile takeover

Luxembourg (a country in Central Europe) / Luxembourg (the capital city of Luxembourg) / Luxembourg (a province of Wallonia, Belgium) / Luxembourg (a canton of Luxembourg)

northern part, northern area

impractical; unpractical