cautionary
1. [ adjective ] tending to ward off
Synonyms: prophylactic preventive
Examples:

"the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze

Related terms: protective
2. [ adjective ] serving to warn
Synonyms: exemplary monitory warning admonitory
Examples:

"shook a monitory finger at him" "an exemplary jail sentence"

Related terms: dissuasive
Similar spelling:   catenary