Definition of "coltish"
coltish
adjective
comparative more coltish, superlative most coltish
Resembling a colt, especially:
Lively, playful and undisciplined (often in a manner judged to be immature).
Quotations
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.
1603, “The Education of Children”, in Philemon Holland, transl., The Philosophie, commonlie called, the Morals written by the learned philosopher Plutarch of Chæronea, London, page 16
[…] 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.
1885, George Meredith, chapter 12, in Diana of the Crossways, volume 3, London: Chapman & Hall, pages 231–232