Bible Greek and Hebrew Dictionaries combined for Word Studies
Genesis Chapter 1
hardness 2553 # kakopatheo {kak-op-ath-eh'-o}; from the same as 2552; to undergo hardship: -- be afflicted, endure afflictions ({hardness}), suffer trouble.
hardness 4165 ## muwtsaq {moo-tsawk'}; from 5694; properly, fusion, i.e. literally, a casting (of metal); figuratively, a mass (of clay): -- casting, {hardness}.
hardness 4457 # porosis {po'-ro-sis}; from 4456; stupidity or callousness: -- blindness, {hardness}.
hardness 4641 # sklerokardia {sklay-rok-ar-dee'-ah}; feminine of a compound of 4642 and 2588; hard-heartedness, i.e. (specifically) destitution of (spiritual) perception: -- {hardness} of heart.
hardness 4643 # sklerotes {sklay-rot'-ace}; from 4642; callousness, i.e. (figuratively) stubbornness: -- {hardness}.