5) a sad night (= a dark, black night, arch. poet.)

Obviously the first three contexts have the common denotation of sorrow whereas in the fourth and fifth contexts the denotations are different. So, in these five coniexts we can identify three meanings of “sad”.

Г.Б.Антрушина, О.В.Афанасьева. Лексикология английского языка. - М. Изд. Дрофа. 1999

F.R.Palmer. Semantics. A new outline. - M. V.Sh. 1982