WordNet sense 1 (capable of being comprehended or understood):

comprehensible, comprehendible

WordNet sense 2 (obtainable or accessible and ready for use or service):

available

WordNet sense 3 (easy to meet or converse or do business with):

approachable

WordNet sense 4 (easy to reach):

convenient, handy

WordNet sense 5 (capable of being reached or attained):

come-at-able, getatable

WordNet sense 6 (easily approached):

reachable