WordNet sense 1 (just barely adequate or within a lower limit):

bare

WordNet sense 2 (very limited in degree):

narrow

WordNet sense 3 (producing little or no profit or gain):

unprofitable

WordNet sense 4 (of questionable or minimal quality):

borderline

WordNet sense 5 (the least possible):

minimal, minimum

WordNet sense 6 (at or constituting a border or edge):

fringy

WordNet sense 7 (on or near an edge or constituting an outer boundary; the outer area):

peripheral

WordNet sense 8 (of a bare living gained by great labor):

hardscrabble

WordNet sense 9 (deficient in amount or quality or extent):

meager, meagerly, stingy, meagre, scrimpy, stingy

WordNet sense 10 (not approved):

disapproved