平白无故 (píng bái wú gù) | Meaning: (idiom) for no reason whatever; inexplicably | Chinese Idiom with Pinyin & Origin

(idiom) no cause or reason; completely uncalled for无缘无故wú yuán wú gù

without cause or reason无故wú gù

irrational · unreasonable无理wú lǐ

lit. to go to war without just cause (idiom) · to act without justification师出无名shī chū wú míng

for no reason (idiom)白眉赤眼bái méi chì yǎn

(idiom) for no reason whatever; inexplicably