"cautionary" in the adjective sense
1. cautionary, prophylactic
"the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze
2. admonitory, cautionary, exemplary, monitory, warning
serving to warn
"shook a monitory finger at him"
"an exemplary jail sentence"
Source: WordNet® (An amazing lexical database of English)
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