introvert: turning inward
extrovert: turning outward
ambivert: a person having both characteristics of introvert and extrovert

ambidextrous: the ability to use both hands with equal skills
                       (ambi: both; dexter: right hand)
dexterous: skillful
dexterity: a. mental skill or quickness  (use of dexterity from wsj.com)
              b. readiness and in physical activity especially skill and ease
                  in using the hands: manual dexterity

eon/aeon: a. an immeasurable or indefinite long period of time
               b1. a very large devision of geological time usually longer than an era
               b2. a unit of geological time equal to one billion years

prosthesis/prosthetics: an artificial device to replace or augment a missing or
               impaired part of the body (pros: in addition to; tithenai: to put)


-One paralyzed woman had enough dexterity to pick up a cup and take a sip of
 coffee through a straw with the help of a neural prosthesis.

gauche: (f. left) a. a lack of social experience or grace; not tactful
             eg. It's gauche to mention that subject
            b. crudely made or done
gaucherie: an awkward, clumsy, tackless embarrassing way of saying things.

adroit: (f. right) having or showing cleverness, skill, resourcefulness in handling
          situations.
          eg. adroit maneuvers

1, self: ego
egoist
egotist
egocentric
egomaniac/al

2, other: alter
altruistic
alternate
alteration-a change, making into something other
altercation-a heated verbal dispute, a violent disagreement, having other plans, ideas or opinions than the other side of the argument.  (use of "altercation" in wsj.com)

3, redact
a, to put (an idea, a story) in writing; frame
b, to select or adapt (as by obscuring or selecting sensitive info) for publication or release; edit
c, to obscure or remove (text) from a document prior to release