'unobtrusively-formed' originates from the combination of 'unobtrusive' and 'formed'. 'Unobtrusive' comes from Latin 'obtrudere', where 'ob-' meant 'against' and 'trudere' meant 'to thrust'.

'Unobtrusive' changed from the Latin word 'obtrudere' to the English word 'unobtrusive', and 'formed' comes from the Old French 'former', which eventually became the modern English word 'form'.

Initially, 'unobtrusive' meant 'not thrusting against', but over time it evolved into its current meaning of 'not attracting attention'.