Words needing a suffix/prefix or lacking an opposite

It’s common to joke about words like underwhelmed/overwhelmed - can one be just whelmed? Or words like subpar that sound awkward if you try to form the opposite - superpar!? Some words even keep their meaning with opposing prefixes or none at all like inflammable!

Any other good/fun examples?

disgruntled

This covers a lot of them

Gormless used to be matched by gormful. Gorm itself is a rather wonderful old English word that deserves a comeback.

Nocent is the missing logical opposite for innocent.

Moved Cafe Society --> IMHO.

It was only recently that I learned that you can fenestrate someone.

No, it doesn’t mean failing to throw them out of a window. It means cutting them open.

Would you believe that I read that original article in 1994, and have regretted not keeping it ever since.

Thank you, honeydew!
mmm