πεπωρωμένην [1 verse]( part sg perf mp fem acc ) "Harden" is from poroo, which means "to petrify", "to turn into stone," and "to harden." -- "Harden" is a verb that means "to petrify", "to turn into stone," and "to harden." It is in the form of an adjective in the same singular form as "heart." The tense is the past perfect, so the sense is "having hardened." The "have" above is not part of this verb. This verb comes first in the clause, introducing the rest.