Ibn Ezra on Isaiah
מְתוֹם A place containing soundness (תּוֹם ‘ soundness or integrity’). The form of the word is irregular, for it should be מָתוֹם like מָעוֹז (25:4). The same form is used Ps. 38:4. R. Moses Hakkohen says that מְתוֹם is the same as מְתִים ‘ people ;’ he quotes a parallel, Judges 20:48, and explains our verse, there is nothing in them that is good for man; but this explanation is rather far-fetched.