(UNPLEASANT) [adjective] [before noun] sadder, saddest - unacceptable; not satisfactoryThe sad fact/truth is we can't afford to provide homes for all.It's a sad reflection/comment on our society that many old people die of the cold each winter.This is the sad state of affairs facing film-makers today.Sad to say, (= It is a cause for regret) the ring was never found.
SAD
Meaning of SAD in English
Cambridge English vocab. Кембриджский английский словарь. 2012