Words words words

Unexplainable = inexplicable?

board stiff ≠ bored stiff

excoriate ≠ exfoliate

negligence ≠ négligée

There are two meanings of the word "commend."  One means to heap praise on someone, the other means to give something or someone over to the care of another.

These two meanings are so unrelated as to be almost opposites.

The daycare provider told the young mother, "I commend your children...."

further or farther?
furthest or farthest?

Even dictionaries don't all agree of the proper usage of these.