Anachronism – A thing not appropriate to a time period
They had a knack for synchronism (anachronism) and marched in time with the other soldiers but they stood out as they were not appropriately dressed for the time period.
Examples of anachronism in a sentence
I regularly watch period dramas to look out for anachronisms in the sets and costumes.
The watch the actor playing King Arthur was wearing was an anachronism.
The book could one day be an anachronism, when the world turns to digital reading completely.