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Definition of obsolete : 1. No longer in use; gone into disuse; disused; neglected; as, an obsolete word; an obsolete statute; - applied chiefly to words, writings, or observances.
2. Not very distinct; obscure; rudimental; imperfectly developed; abortive.
3. To become obsolete; to go out of use.

Synonyms:

Noachian, moribund, fossilized, out, medieval, outworn, démodé, outmoded, out-of-date, superannuated, noncurrent, primitive, obsolescent, superseded, old, passé, dated, archaic, mossy, old-time, old-world, moth-eaten, outdated, on the shelf, prehistoric, used, old-fashioned, study at old, in mothballs, kaput, rare, new, low-tech, Stone Age, antiquated, demoded, neolithic, ancient

forsaken, abandoned, relinquished, refused, rejected, rusty, deserted, disused, unused

Usage examples:

• The right to dismiss a ministry, although unquestionably within the legal prerogative of the Crown, seems to be regarded as one of those powers which the close responsibility of the cabinet to the House of Commons has practically made obsolete. - "The Government of England (Vol. I)", A. Lawrence Lowell.
• Stipe very short or often obsolete. - "The Myxomycetes of the Miami Valley, Ohio", A. P. Morgan.
• Ay, ay, the best terms will grow obsolete. - "A Cursory History of Swearing", Julian Sharman.