| Red-letter (a.) Of or pertaining to a red letter; marked by red letters. Thesaurus Entries catchy, celebrated, conspicuous, deathless, distinguished, eminent, esteemed, estimable, eventful, exceptional, extraordinary, great, historic, illustrious, important, marked, momentous, noble, notable, noteworthy, observable, of mark, outstanding, prestigious, prominent, rare, recollectable, red-letter, remarkable, rememberable, reputable, rubric, salient, signal, significant, special, striking, telling, unforgettable, worthy | ![]() |