The quality or state of being coltish; youthful frivolousness, playfulness, or awkward behavior.
From 'coltish' + '-ness' (forming abstract nouns from adjectives), with '-ness' coming from Old English meaning 'state or quality.' This suffix has been used since before 1000 CE to nominalize adjectives.
English has this amazing system where you can stack suffixes—'colt' → 'coltish' → 'coltishness'—allowing you to zoom from a concrete animal to an abstract quality in just two steps, showing how productive English morphology really is.
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