A little unstable and the least favourite of Water signs, probably because I have Moon in Cancer so I understand how unstable we can get! Cancers are very impressionable and easily led astray by their emotions, I'm only talking about myself here. I don't trust that part of myself so naturally I don't trust Cancers. 😢
The difference between Cancers and the other Water signs is that Scorpios have strong principles and Pisceans are simply cool and non-judgemental. Cancers will always give up their principles once feelings get involved and they probably are the most judgemental and biased sign in the Zodiac because once again, they react on how they feel! Which at least is honest. They are usually the ones to tell 'poilitically incorrect' truths.
But having said all that, I like Cancer chicks because we share the same need for cuddling.. 😉 Generally I think Water signs have magic fingers when it comes to stroking a lions mane. And other stuff .lol