Go back to the army of the Muslims and send us other than thyself, for thou lackest thews, and cry us among the Arabs and Persians and Turks and Medes, 'Whoso has might in him, let him come to us.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "lackest" in a variety of sentences. We hope that you will now be able to make sentences using this word.