WordNet sense 1 (concise and full of meaning):

pithy, sententious

WordNet sense 2 (brief and to the point; effectively cut short):

curt, laconic, terse

WordNet sense 3 (briefly giving the gist of something):

compact, compendious, succinct, summary, compact

WordNet sense 4 (concise and succinct):

brief

WordNet sense 5 (terse and witty and like a maxim):

epigrammatic