"fiend": in anyone's active vocab?

[Douglas Dee]

I'd say "fiend" is in my active vocabulary, but not in its serious sense.

I think I got the word from my grandmother.  If I left a window open, she'd
call me a "fresh air fiend," and if I defeated her at Scrabble, backgammon, or
whatever, she'd say "You're a fiend!"

I'd probably use the word in the same way, but I'd never say anything like,
"The fiends who plotted this terrorist act must be brought to justice."  That
would sound silly.

Doug