'unconditional' originates from the prefix 'un-' meaning 'not' and the word 'conditional', which comes from Latin 'conditio', meaning 'agreement' or 'stipulation'.

'conditional' transformed from the Latin word 'conditio' and eventually became the modern English word 'conditional', with 'un-' added to negate it.

Initially, it meant 'not subject to conditions', and this meaning has largely remained the same in modern usage.