Approachability :: Approachability (n.) The quality of being approachable; approachableness.
Approachable :: Approachable (a.) Capable of being approached; accessible; as, approachable virtue..
Approachableness :: Approachableness (n.) The quality or state of being approachable; accessibility.
Inapproachable :: Inapproachable (a.) Not approachable; unapproachable; inaccessible; unequaled.