coltish

He's four years old now, so he ought to get over those coltish ways.

The Professor's Coltish Daughter regained her adolescent poise, which was considerable.

"He may be dead or dying," the Professor's Coltish Daughter suggested briskly.

"Maybe he's a shape-changer," the Professor's Coltish Daughter said in a burst of evil fantasy.

Old Bess was rearing and plunging with a coltish animation quite inconsistent with the dignity of her twenty-three years.