moodiest
moo-di-est
adjective
Most prone to frequent, unpredictable changes in temper or disposition.
"She was the moodiest person I knew."
Thesaurus
Synonyms: emotional, temperamental, moody, Helen Newington Wills, Helen Wills, Helen Wills Moody, glowering, morose, sour, glum, saturnine, dour