It's hard to relate to someone who has such wild/extreme 'mood swings'. [=someone whose mood changes very quickly]
She turned down the lights and lit a candle to create a more romantic 'mood'. [='atmosphere']
I'm sorry. I'm just not 'in the mood to talk'. [=I do not want to talk to anyone right now]
(..) Nor customary suits of solemn black, nor the windy suspiration of forced breath No, nor the fruitful river in the eye nor the dejected haviour of the visage... ...together with all forms, moods, shows of grief that can denote me truly These indeed seem, for they are actions that a man might play (..)2015 Hamlet