COLTISH

coltish, frolicsome, frolicky, rollicking, sportive

(adjective) given to merry frolicking; “frolicsome students celebrated their graduation with parties and practical jokes”

Source: WordNet® 3.1

Etymology

Adjective

coltish (comparative more coltish, superlative most coltish)

Resembling a colt, especially

Lively, playful and undisciplined (often in a manner judged to be immature).

Synonyms: exuberant, frisky, frolicsome, high-spirited, spirited, unrestrained

Antonyms: serious, sober

Tall, thin and awkward (especially of an older child or adolescent).

Synonym: gangly

Source: Wiktionary

Colt"ish, a.

Definition: Like a colt; wanton; frisky. He was all coltish, full of ragery. Chaucer.

– Colt"ish*ly, adv.

– Colt"ish*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition