難以相信
這是字面本義，最貼近核心畫面。
hard to believe · adjective · B1
So strange or surprising that it is hard to believe.
難以置信的
核心畫面
Break the word into in- (not) + cred- (believe): 'cannot be believed'. The core picture is a thing so far past what's normal that your mind balks — you literally can't take it in.
可以把這個字拆成 in-（不）＋ cred-（相信）：「無法相信」。核心畫面可以想成：眼前的事情大到、誇張到超出你腦…更多收起
可以把這個字拆成 in-（不）＋ cred-（相信）：「無法相信」。核心畫面可以想成：眼前的事情大到、誇張到超出你腦袋能接受的範圍，你一時反應不過來、嚥不下去——「這怎麼可能？」那種卡住的感覺。From the word’s history
From Latin in- (not) + credibilis (believable), from credere (to believe). The modern senses both trace straight to 'not believable'.
源自拉丁文 in-（不）＋ credibilis（可信的），credere 是「相信」。現代兩個意思都直接從「不可信、難以相信」長出來。
Online Etymology Dictionary (etymonline.com), 'incredible'
Two branches
誇張地好、誇張地大
把「無法相信」這個力道借去當誇飾：好到、大到不像真的，於是變成「超棒、驚人」。
amazing · adjective · B1
So good, large, or great that it surprises you.
超棒的 / 驚人的
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
incredibleadj/ɪŋˈkɹɛdɪbəl/
- 1
Too implausible to be credible; beyond belief.
- The extinction of a species once so numerous seemed incredible.
- I get lost in what is credible and not credible. This whole thing gets so incredible when you consider wiping out whole nations, it is difficult to establish credibility.
- 2
Amazing; astonishing; awe-inspiring.
- He was so wrapped up in watching the incredible special effects that he couldn't keep track of the story.
- 3
Marvellous; profoundly affecting; wonderful; excellent.
- I had such an incredible slice of pizza last night that I simply can't think about anything else.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。