Puerile?

You're childish.

What? Childish?

In fact, puerile.

Western Geopolitics An Infantile Disorder

She's the center of a spiderweb of family, money country clubs and timekilling childish employments.

I regret that I don't own you, and I regret even more that you've become my enemy.

Of course, it was not only childish defiance and her recent very unexpected and hard won self confidence which led her to this demand.

Over the edge there peeped a clean cut, boyish face, which looked keenly about it, and then, with a hand on either side of the aperture, drew itself shoulder high and waist high, until one knee rested upon the edge.

Again and again in nature, from the very most ancient bacteria to more recent species, they go through a juvenile phase of hostile competition to establish themselves,

And I hope that this expression will have the same meaning for you as the earlier assertions, and not seem to be a childish and self centred show of pride, for throughout the centuries our ancient and small State has always demonstrated its love of freedom, its will to contribute to balance and harmony, and its concern to maintain peace.