If you're talking about someone who speaks a lot:
* Quiet
* Silent
* Reserved
* Introverted
* Taciturn
* Reticent
If you're talking about someone who enjoys talking:
* Uncommunicative
* Unsociable
* Aloof
* Withdrawn
If you're talking about someone who talks too much:
* Concise
* Brief
* Laconic
* Terse
* Succinct
The best word to use will depend on the specific situation and the nuance you want to convey.