Adjective cautionary has 2 senses
  1. cautionary, preventive, prophylactic - tending to ward off; "the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze
    Antonym: unprotective (indirect, via protective)
  2. admonitory, cautionary, exemplary, monitory, warning - serving to warn; "shook a monitory finger at him"; "an exemplary jail sentence"
    Antonym: persuasive (indirect, via dissuasive)
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