sceptical

[cema]

Firefox does not know the word "sceptical" and underlines it in red. "Sceptic" too, btw. It knows skeptic and skeptical, though.

Comments

[dklein.livejournal.com]

http://www.skeptics.org.uk/article.php?dir=articles&article=skeptic_or_sceptic.php

[cema.livejournal.com]

They say:

Some people, however, do try to make a distinction between the two spellings as if they have different meanings: they do not.

So Firefox is a person now; I did not realize. :-)

Two paragraphs later, they themselves make a distinction, mostly between the -ic and -ical, but c/k too:

To be "a Skeptic" means that the person adheres to the method of scientific skepticism. This is different to being "sceptical" which means to be doubtful.

I would not use the red color in either case.