warning

a message informing of danger; "a warning that still more bombs could explode"

cautionary advice about something imminent (especially imminent danger or other unpleasantness); "a letter of admonition about the dangers of immorality"; "the warning was to beware of surprises"; "his final word of advice was not to play with matches"

notification of something, usually in advance; "they gave little warning of their arrival"; "she had only had four days' warning before leaving Berlin"

serving to warn; "shook a monitory finger at him"; "an exemplary jail sentence"