unbelievable

Compared meaning: so good or extreme it is hard to believe (adjective).

比较义项：令人难以置信的／极好的（adj.）。

• incredible

  Neutral in tone and can describe something impressively large, skillful, or hard to credit; common in both factual and admiring contexts, without a mainly negative or purely positive slant.

  语气中性，可以形容规模、技能等令人难以置信的事物，既能用于事实性描述，也能用于赞叹，不带明显的褒贬色彩。

  Doctors called her recovery incredible, given how serious her injuries had been.

  医生们称她的康复令人难以置信，因为她当初伤得那么重。

• fabulous

  Mainly a strong positive word meaning wonderful or marvelous, used for enjoyable experiences, looks, or lifestyle; informal and enthusiastic, and rarely used for shocking or negative situations.

  主要是强烈的褒义词，表示“极好的、令人赞叹的”，常用于形容愉快的经历、外表或生活方式，语气随意热情，很少用于令人震惊或负面的情况。

  The party was absolutely fabulous — everyone danced and laughed all night.

  那场派对简直棒极了——大家整晚又跳又笑。

• unbelievable 本词

  Emphasizes shock or disbelief and can describe something good or bad (an unbelievable stroke of luck, unbelievable rudeness); stronger and more emotional than incredible, often used to complain or express outrage.

  强调震惊或难以置信的情绪，既可形容好事也可形容坏事（难以置信的好运、令人难以置信的粗鲁），语气比incredible更强烈、更情绪化，常用于抱怨或表达愤慨。

  It's unbelievable how rude that waiter was to an elderly customer.

  那个服务员对一位老年顾客那么粗鲁，简直令人难以置信。

Incredible, fabulous, and unbelievable can all mean so good or extreme it seems hard to believe. Incredible is neutral, for impressive or hard-to-believe facts. Fabulous is strongly positive, meaning wonderful, used informally for enjoyable experiences. Unbelievable shows shock, for either good or bad things.

这三个词都可以表示“好到、或离奇到让人难以置信”，但语气不同：incredible较为中性客观，可用于事实性描述；fabulous带有强烈的褒义，多形容愉快的经历或事物，语气随意热情；unbelievable情绪色彩最强，好事坏事都能用，既可用于惊叹，也可用于抱怨。