THERE ARE YELLOW WEASELS. THEN THERE ARE MODAL WEASELS.

Either way, you're calling an audible that's likely to fail.

Instead of “It could be impossible,” say “The probability is 3%” or “The probability is 17%” or whatever.  Instead of saying, “It’s certainly possible,” say “The probability is greater than zero,” or “The probability is roughly 10%.”  Instead of “It mustn’t be inherently so,” say “The probability is only 86%.”  Do specific numbers seem overly precise?  Then switch to “highly unlikely,” “even odds,” “almost certain,” and such.

You don't sound more nuanced and erudite if you make like a weasel.  That's probably speciesist against weasels, to compare an academic with a weasel is disrespectful of weasels.

Outside of Grievance Studies, academics will crush you for unwarranted certainty.  Otherwise, though, you can qualify your assertions like an eagle – or like a weasel.  So why be a weasel?

Eschew obfuscation!