Coltish

Commeth he in the morning to do his dutie and bid thee good morrow, belching sowre and smelling strongly of wine, which the day before he drunke at the taverne with companions like himselfe? seeme to know nothing. Senteth he of sweete perfumes and costly pomanders? Hold thy peace and say nothing. These are the means to tame and breake a wilde and coltish youth.

Source: wiktionary

Plants rais’d with tenderness are seldom strong, Man’s coltish disposition asks the thong [i.e. whip], And without discipline the fav’rite child, Like a neglected forrester runs wild.

Source: wiktionary

[…] the batsmen were running and stretching bats, and the ball flying away, flying back, and others after it, and still the batsmen running, till it seemed that the ball had escaped control and was leading the fielders on a coltish innings of its own, defiant of bowlers.

Source: wiktionary

He had a tangle of shock hair, the colour of wool; his mouth was a grin; although as strong as a horse, he looked neither heavy nor yet adroit, only leggy, coltish, and in the road.

Source: wiktionary