невероятен

• improbable; unlikely; incredible, unbelievable, past (all) belief, inconceivable
• невероятна история legend, разг. a tall story
• това е просто невероятно that passes (all) belief, it's too good to be true
• невероятно! would you believe it! това е невероятна глупост the stupidity of this passes belief
• Разговорно
• unthinkable