'Heavy' in the Bible

Come unto me, all ye that labour and are heavy laden, and I will give you rest.

For they bind heavy burdens and grievous to be borne, and lay them on men's shoulders; but they themselves will not move them with one of their fingers.

And he took with him Peter and the two sons of Zebedee, and began to be sorrowful and very heavy.

And he came and found them asleep again: for their eyes were heavy.