'unobstructedness' originates from a combination of elements: the negative prefix 'un-' (Old English), the verb 'obstruct' (from Latin 'obstruere'), the adjectival/participial suffix '-ed', and the nominalizing suffix '-ness'. Specifically, 'obstruct' originates from Latin, specifically the word 'obstruere', where 'ob-' meant 'against' and 'struere' meant 'to pile up'.

'obstruere' (Latin) produced Old French forms such as 'obstruer', which entered Middle English as 'obstruct'; English then combined Old English 'un-' + 'obstruct' + '-ed' + '-ness' to produce the modern formation 'unobstructedness'.

Initially, the root 'obstruere' carried the sense 'to pile up against' or 'to block'; over time the components were used in English to form a noun meaning 'the condition of not being blocked', i.e., 'the state of being free from obstruction'.