G4642–σκληρός–sklēros

"But, next, the man who had the one talent in his keeping came and said, "`Sir, I knew you to be a severe man, reaping where you had not sown and garnering what you had not winnowed.

σκληρὸς sklēros “hard”

Many therefore of His disciples, when they heard it, said, "This is hard to accept. Who can listen to such teaching?"

σκληρός sklēros “Difficult”

"Who art thou, Lord?" he asked. "I am Jesus, whom you are persecuting," was the reply.

σκληρόν sklēron “hard”

We all fell to the ground; and I heard a voice which said to me in Hebrew, "`Saul, Saul, why are you persecuting Me? You are finding it painful to kick against the ox-goad.'

σκληρόν sklēron “[It is] hard”

So too with ships, great as they are, and often driven along by strong gales, yet they can be steered with a very small rudder in whichever direction the caprice of the man at the helm chooses.

σκληρῶν sklērōn “strong”

and to convict all the ungodly of all the ungodly deeds which in their ungodliness they have committed, and of all the hard words which they, ungodly sinners as they are, have spoken against Him."

σκληρῶν sklērōn “harsh [things]”