'Hard' in the Bible

You whose hearts are hard and whose ears are shut to me; you are ever working against the Holy Spirit; as your fathers did, so do you.

But Saul, whose other name is Paul, being full of the Holy Spirit, looking hard at him, said,

And even with these words, it was hard for them to keep the people from making an offering to them.

Why then are you testing God, by putting on the neck of the disciples a yoke so hard that not even our fathers or we were strong enough for it?

And when we had all gone down on the earth, a voice came to me, saying in the Hebrew language, Saul, Saul, why are you attacking me so cruelly? It is hard for you to go against the impulse which is driving you.

And when we had gone on slowly for a long time, and had had hard work getting across to Cnidus, for the wind was against us, we went under cover of Crete, in the direction of Salmone;

And, sailing near the side of a small island named Cauda, we were able, though it was hard work, to make the ship's boat safe: