Yes, definitely.

**Disclaimer**<br>
I am not nearly as proficient in classical Chinese, so my answer is limited to modern Chinese. 

IMHO, 未 is more commonly seen in formal context and is often used with 曾 or 從, as in 未曾 or 從未.

For example,

> 單純的你，**未曾憂鬱**過。

You're such a simple person; you'**ve never been depressed**.

> 人生自古以來，**從未順利**。

Since the ancient times, life (of a human) **has never been smooth**.

Note that the adjectives act similarly to a verb, as suggested by WangYudong above. I don't think 長 and 短 are verbs per se.

**EDIT:**<br>
FYI, as FortCpp explained below, adjectives in such construct may actually be verbs.

  [1]: http://chinese.stackexchange.com/a/13573/9722