这些词都是用来描述在某些方面与他人或事物不同的人或事物。

最常用的词是“different”。

I like her haircut - it's different!

She's very different from her sister.

I've asked for them to bring me a different dish.

如果某人或某物与某人或某物dissimilar（不相似），他们非常不同。你也可以用not dissimilar这个短语来指出两件事或两个人在大多数方面是相同的或相似的。

The twins may look alike, but they are quite dissimilar when it comes to personality.

This office is not dissimilar to our old one, except for the colour of the carpeting.

dissimilar 的反义词是 similar.

The boys are very similar.

I have a similar problem.

要说某物是由许多不同类型的人或物组成的，你可以用diverse。

London is a culturally diverse city.

The voters are a very diverse group, made up of people from all walks of life.

在正式的和科学的语境中，异质（heterogeneous）的这个词被用来指一个有很多不同的东西或人在里面的群体。

They tested a heterogeneous population.

The opposite of heterogeneous is homogeneous. Heterogeneous is more formal than homogeneous.

The area's population has remained homogeneous, with very little migration in or out.

如果某件事与人们通常期望的不同，你可以说它是不寻常的（unusual）。

Carina - that's quite an unusual name.

形容词alternative通常用来描述某物与另一物不同，但可以代替它。在美式英语中，你也可以以同样的方式使用形容词alternate。

The hotel's being renovated, so we're looking for an alternative venue.

US The movie theater is closed, so we'll have to make alternate plans.

如果某物与其他事物非常不同，你可以用distinct或distinctive来形容它。

The word has three distinct meanings.

She's got really distinctive handwriting.

介词unlike通常用来比较彼此非常不同的人或事物。

Dan's actually quite nice, unlike his father.

The furniture was unlike anything she had ever seen.