'unheraldic' originates from English, formed by the negative prefix 'un-' (from Old English/Proto-Germanic meaning 'not') attached to 'heraldic', which in turn derives from 'herald'.

'herald' comes from Old French 'heraut' (also spelled 'heraut'/'heraut'), ultimately from a Germanic source (Frankish *hariwald or Old High German 'heri' "army" + 'wald' "rule"); 'heraldic' developed from 'herald' to mean 'of or relating to heraldry', and 'un-' was later prefixed to form 'unheraldic'.

Originally 'herald' referred to a messenger or officer concerned with announcements and, later, with coats of arms; 'heraldic' meant 'pertaining to heraldry', and 'unheraldic' has the straightforward negative meaning 'not pertaining to heraldry' (this sense has been consistent since the formation of the adjective).