inconceivable
adj
1 (infml 口) very difficult to believe 难以置信的
It seems inconceivable that the accident could have happened so quickly. 这一事故发生得这麽快, 简直不可思议.
2 that cannot be imagined; not conceivable 不可想像的; 匪夷所思的
the inconceivable vastness of space 宇宙难以想像的广漠.