IPA: /ˈkoʊltɪʃnəs/
KK: /ˈkoʊltɪʃnəs/
The quality of being lively, playful, or energetic, often in a youthful or spirited way.
The coltishness of the young horse made it difficult to control during training.
Coltishness is formed from "colt" (from Old English *culta*, meaning a young horse) and "-ish" (meaning having the qualities of) combined with the suffix "-ness" (meaning the state or quality of). The word describes the state or quality of being like a colt, often implying youthful, playful, or spirited behavior.
Think of a young horse, a 'colt', and how 'coltishness' refers to the playful and spirited qualities that a young horse might have.