| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | no longer in use, in vogue |
| Synonyms: | anachronistic, ancient, antediluvian, antiquated, antique, archaic, bygone, dated, dead, dead and gone, dinosaur, discarded, disused, done for, dusty, extinct, fossil, gone, had it, has-been, horse and buggy, kaput, moldy, moth-eaten, old, old-fashioned, old-hat, old-school, out*, out-of-date, out-of-fashion, outmoded, outworn, passé, stale, superannuated, superseded, timeworn, unfashionable |
| Notes: | things that are no longer used or needed are obsolete; things that are becoming obsolete are obsolescent |
| Antonyms: | contemporary, current, in vogue, modern, new, present, up-to-date |
| Main Entry: | antediluvian |
| Part of Speech: | adjective |
| Definition: | out-of-date; prehistoric |
| Synonyms: | age-old, ancient, antiquated, antique, archaic, hoary, obsolete, old, old-fashioned, passé, primeval, primitive, primordial, timeworn, venerable |
| Antonyms: | modern, new, up-to-date, young |
| Main Entry: | antiquarian |
| Part of Speech: | adjective |
| Definition: | old, ancient |
| Synonyms: | aged, antique, archaic, hoary, obsolete, primitive, timeworn, venerable |
| Antonyms: | modern, new, young |
| Main Entry: | antique |
| Part of Speech: | adjective |
| Definition: | old |
| Synonyms: | aged, ancient, elderly, obsolescent, obsolete, out-of-date, outdated, prehistoric, superannuated |
| Antonyms: | modern, new, recent, up-to-date |
| Main Entry: | antique |
| Part of Speech: | adjective |
| Definition: | old-fashioned |
| Synonyms: | antiquarian, archaic, classic, obsolete, olden, outdated, vintage |
| Antonyms: | current, fresh, modern |
| Main Entry: | archaic |
| Part of Speech: | adjective |
| Definition: | very old |
| Synonyms: | ancient, antiquated, antique, bygone, obsolete, old-fashioned, olden, out of date, outmoded, passé, primitive, superannuated |
| Antonyms: | current, modern, new, present, young |
| Main Entry: | behind the times |
| Part of Speech: | adjective |
| Definition: | not current |
| Synonyms: | antiquated, back-number, dated, has-been, obsolete, of the old school, old hat, old hat, old-fashioned, out of date, out-of-date, outdated, outmoded, passe, square, unfashionable |
| Main Entry: | date |
| Part of Speech: | verb |
| Definition: | become obsolete |
| Synonyms: | antiquate, archaize, obsolesce, obsolete, outdate, show one's age |
| Main Entry: | dated |
| Part of Speech: | adjective |
| Definition: | out-of-date |
| Synonyms: | antiquated, archaic, behind the times, obsolescent, obsolete, old hat, old-fashioned, out of style, outdated, outmoded, passé, unfashionable |