A genitive substantive that functions in the same way as an adverb, as such it modifies a verb rather than a substantive. Expressing the kind of time within which an action takes place, or one kind of time as opposed to another. Translate: supply during, at, within.djectival genitive = a person is justified not by works of the law but by the faithfulness OF JESUS CHRIST. Examples of verbal nouns: orgh, agaph, dehsiV.... Where the genitive substantive produces the action implied by the verbal noun. Often this genitive can be classified as adjectival, possessive.