'shagginess' originates from English, specifically the adjective 'shaggy' combined with the suffix '-ness' to form a noun meaning 'the state of being shaggy.'

'shagginess' developed from Middle English forms related to 'shaggy' (from words like 'schagge'/'schaggy'), with 'shaggy' itself deriving from the noun 'shag' (a tuft or rough hair) and later taking the adjectival suffix '-y' before modern formation with '-ness'.

Initially the related words referred specifically to coarse hair or a tuft ('shag' as a noun); over time the adjectival sense 'shaggy' broadened to describe any long, rough, or untidy hair/fur or textured surface, and 'shagginess' came to denote that condition.