From Longman Dictionary of Contemporary Englishbe in a bad moodbe in a bad mood (also be in a bad temper British English)BAD-TEMPERED to feel annoyed or angry The boss is in a bad mood. → bad
Examples from the Corpus
be in a bad mood• I had to wait two hours for the train, which really put me in a bad mood.• Maybe he was in a bad mood.• Sister Isabel is in a bad mood.• He seems to be in a bad mood about something.• The feeling of contentment produced by gin-and-water had now disappeared, and the beadle was in a bad mood once more.• Nubenehem was in a bad mood, reaching for her liquor jar and belching.• Why were you in such a bad mood this morning?• Ignore her, she is in a bad mood today.• But I was in a bad mood with myself. 