Reserved

[Kai]

Contrary to the other definition, reserved is a characteristic of a person whom socializes sparingly.
It is shown not out of inability to converse or work with other, but instead permits them to be [self-aware] of whom, what, when, where, [why and] how they talk to people.
A reserved person may speak less in groups because they prefer to listen to what is being said, and who is saying it.
When they have formulated a contribution to a discussion, its generally well thought out.
Reserved people garner the respect of their peers and do not seek to offend intentionally.
As opposed to an anti-social or [asocial] person, reserved people DO know how to talk to their peers and delight in interaction, although very brief.
This is not to be conflated with socially awkward or [socially retarded], or even shy; all of which stem from social anxiety, but hold some form of connection to being reserved.

[Lanell]

Slow to reveal emotion or opinions.

[Donald Trump]

Someone who isnt very [social] and prefers [not to be] [talked] to.

[Mark Zuckerberg]

When two people are not dating but are going to date in the future. Its that middle stage [between friends] and [boyfriend and girlfriend] (or two same gender [couples]).