adj. 不可相信的;站不住腳的;(由于太好或太糟而)令人難以置信的;非常驚人的;
"Tom was driving his sports car at an unbelievable high speed."
湯姆正在以令人難以相信的高速駕駛著自己的跑車.
近義:imaginary, implausible, improbable, inconceivable, incredible, unaccountable
反義:likely, plausible, reliable, verisimilar, colourable, colorable