causeless

adj.

无显著原因的，偶然的；

1. He became more irritable than ever, and it was Princess Marya who as a rule bore the brunt of his outbursts of causeless fury.
   他已经变得比从前更易于激动，多半在公爵小姐玛丽亚身上发泄他那无缘无故的怒火。

Causeless complicity
A Causeless Battle
Wainwright on causeless beings— An ontological disproof?
The use of vitamins in "causeless"male infertility
Image diagnosis: a curious case of causeless clubbing.
On the Alleged Causeless Beginning of the Universe: A Reply to Quentin Smith
This Causeless War: The Transformation of New Orleans Newspapers during Union Occupation
Recovery causeless of non-residential property: a reflection about the action and immediate injunction vacancy
Causeless appearance discontentment in patients of plastic surgeons and cosmetologists: Risk factors and patterns of dynamics
The Permanente Journal - Kaiser Permanente - Image Diagnosis: A Curious Case of Causeless Clubbing