How to say “I want; I don't want” without a verb?

Question

I know how to say "I want" using たい after a verb, but how a say just "I want, I don't want" without a verb? Using just たい Or たいくない? And in the past?

Answer 1

You can say it using the word ほしい. For example:

新{あたら}しい車{くるま}がほしい。
I want a new car.

ほしい conjugates the same way as a normal i-adjective:

ほしかった
ほしくない
ほしくなかった

BTW, I don't know if it was just a typo but it should be たくない not たいくない for the negative form.

Answer 2

〜が欲しい - I want ...
〜が欲しくない - I don't want ...
〜が欲しかった - I wanted ...
〜が欲しくなかった - I didn't want ...