From G4642; {callousness} that {is} (figuratively) stubbornness: - hardness.
Verse
Matrix
Mat 25:24Then he which had received the one talent came and said, Lord, I knew thee that thou art an hardG4642 man, reaping where thou hast not sown, and gathering where thou hast not strawed:
Act 26:14And when we were all fallen to the earth, I heard a voice speaking unto me, and saying in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is hardG4642 for thee to kick against the pricks.
Jam 3:4Behold also the ships, which though they be so great, and are driven of fierceG4642 winds, yet are they turned about with a very small helm, whithersoever the governor listeth.
Jud 1:15To execute judgment upon all, and to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hardG4642speeches which ungodly sinners have spoken against him.