twilight

[1]	dusk , dusk , gloaming , sunset , gloaming , gloam , nightfall , sundown , half-light , evenfall , fall , crepuscule/crepuscle , crepuscule , crepuscle
[2]	decline , wane , waning , ebb , downturn , down-swing , slump , decay , weakening , declination , diminution

adj.

[1]	evening , crepuscular , dimming , darkening , darkish , darksome , shadowy , shady , dim , dark , obscure , sombre , gloomy , (Literary) darkling
[2]	twilight zone , dusky , twilit , limbo