If you think any fight with these women would be easy, then you aren't smart enough to live.
The ground is being decimated right beneath your very feet. The air is filling with bloody weapons that have killed more people than you have seen in your life. Your mind is becoming mush as it is subjected to its invader. Your innards are being rendered useless as they are struck by smooth palms. The lifeless body of yours is limp and no better than scrap forever more as it is destroyed by the "just women" you underestimated.
Never belittle these women. For these aren't just women, they are kunoichi.
These "women" lure subjecting, foolish men in and eradicate them. They smile shyly and act defenseless while silently contemplating how to take their target down. Behind their luscious hair, sweet smiles, goddess like features, and wide, deep eyes, there is a ninja: a murderer. Someone who could mutilate another without conscious effort.
And these ninja aren't just kunoichi. They are Konoha's kunoichi.
Everyday these women hide their pain, their fear. They remember lost lovers, and cold, icy glares. They remember petty little arguments and being tossed aside by family. They remember no one believing in them because they didn't believe in themselves: because there wasn't anything to believe in.
And Konoha's kunoichi are something different than your average kunoichi.
And so they trained, day in and day out, before sunrise until long after sunset. They sought their own goals and didn't let anyone, even their boys get in the way: in fact, that's what mainly kept them going. They pushed themselves beyond their limits' far vision. They learned pain, and sorrow, and tears. But not once did they learn weakness.
Konoha kunoichi have something that most ninja don't and don't have something that most ninja do.
Most ninja question emotion and letting people get close. They consider anyone that close to be a weakness. And so they push themselves further into the isolation that most think a ninja should be in. But for these kunoichi, that isn't riding them of their weakness. That is loneliness. And loneliness is something these kunoichi won't stand for.
They have hope.
They use their drive to protect their friends, and their need to defend their village to fight longer, harder, and stronger than others. They don't need loneliness, for they have love. They have family. They have comrades in arms that they would gladly die to protect. And they have people who would at the drop of a hat take the punch that was meant for them.
However, they don't have weakness.
These kunoichi know love and hatred, happiness and sorrow, friendship and loneliness. That is why they are strong. That is why even if you manage to land a blow on them, it will be given back to you ten times more deadly. These kunoichi have more to gain and even more to lose. That is why they don't consider being human a weakness. It drives them further than they ever could go without it.
And that is why when you underestimate them, you are signing away a chance a life after the battle.