warning
noun
1 the earthquake came without warning:
notice, advance notice, a word of warning, forewarning, alert;
hint, signal, sign, alarm bells;
informal a tip-off.
2 cigarette packets are required to carry a health warning:
caution, piece of advice, notification, information;
exhortation, injunction, a (warning) shot across the bows;
advice, counseling;
informal a word to the wise.
3 a warning of things to come:
omen, premonition, foreboding, prophecy, prediction, forecast, token, portent, augury, signal, sign, threat;
literary foretoken.