wú​yuán​wú​gù

groundless

无缘无故 (無緣無故) wú​yuán​wú​gù
groundless idiom
(idiom) without cause or reason; completely uncalled for

无缘无故脾气

wú​yuán​wú​gù de duì pí​qi.

He lost his temper with me for no reason at all.

Frequency

Movie subtitles
4.89 per million appears in 2% of films
Written text
2.82 per million

Sources

Definitions
CC-CEDICT