The Collaborative International Dictionary
Coltish \Colt"ish\, a. Like a colt; wanton; frisky.
He was all coltish, full of ragery.
--Chaucer.
-- Colt"ish*ly, adv. -- Colt"ish*ness, n.
Wiktionary
adv. In a coltish manner.
Usage examples of "coltishly".
He was chocolate skin on a middleweight wrestler's frame, she was tall, pale, and coltishly slim.
She sat there now, her knees drawn up to her chin, coltishly long legs protruding from the bottom of her skirts and her dangling braids brushing the rock behind her.
He could no longer make out the rack of her ribs beneath the smooth pale skin, but her buttocks were still lean as a boy's and her limbs coltishly long and slim.
At fourteen, she'd just emerged from the coltishly awkward stage, although there were moments—like this one—when she suffered temporary relapses.
It trembled coltishly, bounced into and out of a muddy hole, making a grinding noise as it pressed brambles, grass and milkweed plants out of the way, moving slowly but deliberately forward.