HARD-HEARTED Copy link • HARD-HEARTEDdurus: animi duri: ferreus (that has a heart like steel or flint): immitis (unmerciful): inhumanus (without feeling, inhuman): asper: asperi animi (rough in behavior, without indulgence): inexorabilis: durus atque inexorabilis (inexorable, hard): immanis: immani acerbaque natura (cruel, of cruel character): ☞ dirus, in this sense, is poetical only. To be hard-hearted, duro esse animo or ingenio.