In an irritable or depressed state of mind. For example,
Dad's in a bad mood, so don't ask for anything right now. The antonym,
in a good mood, refers to a cheerful, well-disposed state of mind, as in
When the boss is in a good mood our whole day goes well. The phrase
in a mood, meaning "disposed" or "inclined," dates from about a.d. 1000. Also see
in the mood.