'unfashionably-performed' originates from the prefix 'un-' meaning 'not', combined with 'fashionably', derived from 'fashion', and 'performed', from the Latin 'performare'.

'unfashionably-performed' evolved from the combination of 'unfashionable' and 'performed', maintaining its meaning of being out of style in execution.

Initially, it meant 'not performed in a fashionable manner', and this meaning has largely remained the same in modern usage.