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.
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'
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原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，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.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。