Antonyms of widespread:
specific, concentrated, circumscribed, limited, restricted, narrow.
Examples of usage:
  1. No sooner I thought, the dango incident closed than the red towel became the topic for widespread gossip.
    "Botchan (Master Darling)", Mr. Kin-nosuke Natsume, trans. by Yasotaro Morri.
  2. Agreement was widespread that the government service was greatly improved.
    "The United States Since The Civil War", Charles Ramsdell Lingley.
  3. Failing to win the support of the Christians, they instituted a widespread persecution of the Christian leaders of the north.
    "Korea's Fight for Freedom", F.A. McKenzie.