indefensible

英 [ɪndɪ'fensɪb(ə)l] 美[,ɪndɪ'fɛnsəbl]

• adj. 站不住脚的；不能防卫的；无辩护余地的

1. (of theories etc) incapable of being defended or justified

2. incapable of being justified or explained