What do we call a person who speaks less?

There isn't one perfect word to describe someone who speaks less. Here are some options, depending on the nuance you want to convey:

Neutral:

* Quiet

* Reserved

* Introverted

* Laconic (brief and to the point)

* Silent (rarely speaking)

Positive:

* Thoughtful

* Considerate

* Observant

* Wise

Negative:

* Shy

* Timid

* Uncommunicative

* Reticent (reluctant to speak)

Other:

* Stoic (showing little emotion)

* Secretive (not willing to share information)

* Introspective (focused on their own thoughts)

The best word to use depends on the context and the specific reason why the person speaks less.