After a difficult day at work, you return home in a foulmood.
Times, Sunday Times (2016)
The head of department was in such a foulmood.
The Sun (2010)
Definition of 'mood'
mood
(muːd)Explore 'mood' in the dictionary
countable noun [oft adjective NOUN] [oft inNOUN]
Your mood is the way you are feeling at a particular time. If you are in a good mood, you feel cheerful. If you are in a bad mood, you feel angry and impatient.
See in the mood for/to
Definition of 'foul'
foul
(faʊl)Explore 'foul' in the dictionary
adjective [usually ADJECTIVE noun]
If someone has a foul temper or is in a foul mood, they become angry or violent very suddenly and easily.