Sometimes you may hear someone say, “Don’t be so skeptical, have an open mind!”
But they of course are not the opposite of one another, they are the opposite of opposite! lol.
Being skeptical is having an open mind, a questioning mind, a beginners mind, a scientific mind, a don’t-know mind… a buddha mind.
Of course, being ‘skeptical’ is sometimes simply a polite way of saying to someone “I don’t believe that!” lol.