'unstriped' originates from English, formed by the negative prefix 'un-' + the adjective 'striped' (the past-participle/adjectival form of the verb 'stripe').

'striped' comes from the verb 'stripe', which in Middle English appeared as 'stripe' (meaning 'to mark with stripes') and developed into the modern adjective 'striped'; 'un-' is an Old English prefix used to negate adjectives and verbs, producing 'unstriped'.

Initially, the elements meant 'not' (un-) and 'to mark with stripes' (stripe); combined, they have kept the straightforward meaning 'not having stripes'.