G4642–σκληρός–sklēros

And he also that had received the one talent came and said, Lord, I knew thee that thou art a hard man, reaping where thou didst not sow, and gathering where thou didst not scatter;

σκληρὸς sklēros “hard”

Many therefore of his disciples, when the heard [supplied: this], said, This is a hard saying; who can hear it?

σκληρός sklēros “Difficult”

And he said, Who art thou, Lord? And he [supplied: said], I am Jesus whom thou persecutest:

σκληρόν sklēron “hard”

And when we were all fallen to the earth, I heard a voice saying unto me in the Hebrew language, Saul, Saul, why persecutest thou me? it is hard for thee to kick against the goad.

σκληρόν sklēron “[It is] hard”

Behold, the ships also, though they are so great and are driven by rough winds, are yet turned about by a very small rudder, whither the impulse of the steersman willeth.

σκληρῶν sklērōn “strong”

to execute judgment upon all, and to convict all the ungodly of all their works of ungodliness which they have ungodly wrought, and of all the hard things which ungodly sinners have spoken against him.

σκληρῶν sklērōn “harsh [things]”