ἀρκετὸν [ 2 verses ](adj sg neut nom) "It is enough" is arketos, which means "satisfactory," "(it is) enough," and "sufficient." It is the adjective form of arkeo-, which means "to ward off," and "to keep off" and which is used to mean "to be strong enough," "to be a match for," and "to be satisfied with." -- "Enough" is translated from a Greek word that means "sufficient."  This is the adjective form of a word that means "to ward off," and "to keep off" and which is used to mean "to be strong enough," "to be a match for," and "to be satisfied with." The form is that of a subject but one without a verb.