无缘无故

1.withoutprovocation  

无的英语翻译：

naught; nonexistence; not; nothing; without; lack; zero
【医】 a-; leipo-; lipo-; non-

缘的英语翻译：

along; edge; predestined relationship; reason
【医】 acies; border; brim; edge; fringe; labrum; limbus; margin; margines
margo; ora; rim

无故的英语翻译：

without reason
【法】 without cause