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Unsteadiness, Disorderly, Irregular, Erratic, Inconsistent
noun, な adjective
You know that 規則 means "rule" or "regulation." So a not "rule" or "regulation" is an irregularity.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
My health was ruined by my disorderly life.