'showily-displayed' originates from Modern English as a compound of 'showily' and 'displayed'. 'showily' comes from 'showy' + '-ly' (where 'showy' ultimately derives from 'show' meaning 'to exhibit'), and 'displayed' is the past participle of 'display' (from Old French 'despleier').

'display' changed from Old French 'despleier' (from Vulgar/Latin roots related to 'plicare' meaning 'to fold') to Middle English forms such as 'displeien' and eventually became the modern English word 'display'. 'show' comes from Old English 'sceawian' (to look or show) and developed into Modern English 'show', then 'showy' and 'showily'.

Initially, 'display' (etymologically) meant 'to unfold' or 'to spread out', but over time it evolved into its current sense of 'to show or exhibit'; the compound 'showily-displayed' thus carries the modern sense of being conspicuously shown.