noun, na-adjective
uneven temper; capriciousness; whimsicality
Describes a personality or mood that changes unpredictably; often used for someone who is moody, temperamental, or acts on a whim. Can be used as a noun or na-adjective.
彼はむら気で、急に機嫌が悪くなることがある。
He is capricious and sometimes suddenly gets into a bad mood.
むら気な性格のせいで、周りは振り回される。
Because of his whimsical personality, those around him are at his mercy.
Katakana variant of the first part, sometimes used for emphasis or stylistic reasons.
Full kanji spelling using 斑 (uneven, spotted). Rare and may be unfamiliar to many readers.
むら (斑) means 'uneven' or 'spotted', and 気 (き) means 'spirit' or 'temper'. The combination literally suggests an uneven disposition. The reading むらぎ is a voiced variant, but むらき is more common.