Synonyms of unprecedented in English:

unparalleled, unequalled, unmatched, unrivalled, without parallel, without equal

extraordinary, uncommon, out of the ordinary, unusual, outstanding, striking, exceptional, prodigious, abnormal, singular, remarkable, unique, anomalous, atypical, untypical, freakish

unheard of, unknown, novel, original, new, groundbreaking, revolutionary, pioneering

informal one of a kind

rare unexampled