Speaking of words with little-known opposite forms, there's:
feckless (FEK-les) - adj., ineffectual, incompetent; lacking purpose or responsibility, indifferent, lazy.
Describes someone who lacks feck, but what exactly is feck? It turns out to be a shortened form (via Scots English) of effect -- and yes, originally it was fectless, but even the Scots found that -t- hard to say convin. So someone who is feckless has no effect. But we never heard a feck person, or feckful, or whatever the way to say that is.
---L.
feckless (FEK-les) - adj., ineffectual, incompetent; lacking purpose or responsibility, indifferent, lazy.
Describes someone who lacks feck, but what exactly is feck? It turns out to be a shortened form (via Scots English) of effect -- and yes, originally it was fectless, but even the Scots found that -t- hard to say convin. So someone who is feckless has no effect. But we never heard a feck person, or feckful, or whatever the way to say that is.
---L.