'unquestionably-built' originates from the combination of 'unquestionably' and 'built'. 'Unquestionably' comes from the word 'question', which originates from Latin 'quaestionem', meaning 'a seeking, inquiry'. 'Built' is the past participle of 'build', which comes from Old English 'byldan', meaning 'to construct'.

'unquestionably' evolved from the Latin 'quaestionem' through Old French 'question', and 'built' evolved from Old English 'byldan'.

Initially, 'question' meant 'a seeking or inquiry', and 'build' meant 'to construct'. Over time, 'unquestionably-built' came to mean 'constructed in a manner that leaves no doubt'.