Hi - yet another newcomer to these pages, so please forgive any shortcomings.

At work a few days ago the word "ept" cropped up (meaning not inept), and started me thinking about similar nonexistent opposites. Ept reminded me of the classic "ert", and a little thinking yielded "gruntled" and "shevelled". I remember a novel featuring a character whose nickname was "reck" (not in the slightest bit reckless), which then led me on to "feck" and "hap", but that's as far as I got. I'm fairly sure I'm missing some much better, and much more common examples.

Any suggestions?