Synonyms:
admonitory, cautionary, exemplary, monitory, warning(a)
Meaning: serving to warn; "shook a monitory finger at him"; "an exemplary jail sentence"
Synonyms:
cautionary, prophylactic
Meaning: warding off; "the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze
Usage examples
"This is the fourth and last cautionary announcement.