'unpatriotically' originates from English, formed by the prefix 'un-' + the adjective 'patriotic', where 'un-' meant 'not' and 'patriotic' comes from 'patriot'.

'patriotic' comes from 'patriot', which entered English via French 'patriote' and Latin 'patriota', ultimately from Greek 'patriōtēs' meaning 'fellow countryman'; the adverbial suffix '-ally' (from Old French/Latin '-alis') was later added to form 'patriotically', and then the negative prefix 'un-' created 'unpatriotically'.

Initially related words meant 'fellow countryman' or 'devoted to one's country'; over time they came to mean 'showing devotion to one's country', and with the prefix 'un-' the meaning shifted to 'not showing devotion to one's country' (i.e., 'in a manner not patriotic').