There are two words translated "amiss" in the New Testament, atopos, referring to that which is improper or harmful (Luke 23:41; Acts 28:6), while kakos, refers to that which is evil in the sense of a disaster, then to that which is wicked, morally wrong. This latter is the use of it in James 4:3. The purpose of the prayer is evil, it is therefore amiss and cannot be granted (compare 2 Chronicles 6:37).
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Orr, James, M.A., D.D. General Editor. "Entry for 'AMISS'". "International Standard Bible Encyclopedia". <http://classic.studylight.org/enc/isb/view.cgi?number=T463>. 1915.