Dict: strongs - hearts
Strongs:
G2589 @ καρδιογνώστης kardiognōstēs kar-dee-og-noce'-tace From G2588 and G1097; a heart knower: - which knowest the hearts.
G674 @ ἀποψύχω apopsuchō ap-ops-oo'-kho From G575 and G5594; to breathe out that is faint: - hearts failing.