Not to change the subject, but you did mention the word apt. Did anyone see Tsuwm's Worthless Word of the Day today? Ept? In the sentence quoted by EB White (from letters), Shu wondered if maybe it was misread as ept, having meant apt. The fact is, the OED did not have the original EB White letters; they cited a book that claimed to have them.
Is "ept" really bad enough to be termed "worthless"?
[Hey! I finally got into the OED so my 2014 New Years resolution has already been met!] The OED says that ept is a "deliberate" antonym of inept. The first citation for ept was from 1938, whereas the first citation for inept was from 1603. So historically it hasn't been used much. One can't tell current useage from Google hits because there are a lot of ept acronyms.