Liddell-Scott-Jones

ἀκάρδιος (akardios) heartless ^G:A

ἀκάρδιος, ον,

wanting the heart, [Refs 1st c.AD+]: metaphorically, spiritless, cowardly, [Refs 3rd c.BC+]; heartless, weak, [LXX]; ἄφωνος καὶ ἀ. [Refs 5th c.AD+]

__II of wood, without heart or pith, solid, [Refs 4th c.BC+]

_{LSJ Scripture Refs: LXX.Jer.5.21}