mood
The French word 'humeur' is used to express a person's emotional state or feelings at a particular time. In a sentence, you might say 'Ma humeur est bonne aujourd'hui' which translates to 'My mood is good today'. It's important to note that 'humeur' is feminine in gender, so adjectives and articles used with it must match that gender.
He is of changing mood
This sentence is an observation about someone's fluctuating emotional state. The phrase 'Il est d'humeur changeante' can be used when the person in question frequently switches between different moods.
I'm in a good mood today
This sentence is generally used to express a positive emotional state. 'Je suis de bonne humeur aujourd'hui' is often said when someone is feeling particularly optimistic or happy that day.
Your bad mood is ruining the evening
This sentence can be used to express disappointment or frustration in a social setting. The speaker expresses that the poor mood or attitude of the person they are addressing is negatively affecting the ambiance.