The Spanish word 'evasiva' (meaning 'evasive') comes from Latin roots. It was formed from the Latin verb 'evadere' meaning 'to escape', which itself was a combination of the prefix 'ex-' (meaning 'out') and the verb 'vadere' (meaning 'to go' or 'to walk'). The Latin past participle 'evasus' ('escaped') combined with the Spanish adjective suffix '-ivo' gave us the modern Spanish word 'evasiva'.

You can think of the etymology literally as describing someone or something that 'walks out' or 'goes away' from a situation, which evolved to mean being evasive or avoiding giving direct answers.

Some related Spanish words include 'evadir' (to evade), 'invasión' (invasion - literally 'going in' rather than 'going out'), and 'vadear' (to wade or ford - from the same root 'vadere' meaning 'to go/walk'). You can see how all these words relate to movement or passage.

English speakers will recognize the connection to words like 'evade', 'evasion', and 'evasive', which all come from the same Latin root 'evadere'. The word 'invade' is also related, using the opposite prefix 'in-' (meaning 'in') instead of 'ex-' ('out'). Even the word 'wade' (as in wading through water) is distantly related, coming from the same Indo-European root as Latin 'vadere'.