THESAURUS
warn
admonish, advise, alarm, alert, apprehend, apprise, arouse, ask, ask for, be imminent, blackmail, bludgeon, bode, bulldoze, call for, caution, challenge, charge, claim, clamor for, comminate, counsel, croak, cry for, cry havoc, cry out against, cry wolf, daunt, demand, denounce, direct, dissuade, encourage, enjoin, exact, exhort, expostulate, extort, fly storm warnings, forebode, forewarn, frighten, frighten off, give fair warning, give notice, give warning, guide, have a premonition, have a presentiment, impose, incite, indent, induce, inform, intimidate, issue a caveat, issue an ultimatum, kid out of, levy, look black, look threatening, lower, make a demand, menace, move, notify, order, order up, persuade, place an order, portend, preach, preapprehend, prompt, put in requisition, remonstrate, require, requisition, screw, sound the alarm, sound the tocsin, startle, talk out of, tell, threaten, tip, tip off, unpersuade, urge, utter a caveat, utter threats against,
warn against
ROGET THESAURUS
warn
Dissuasion
VB
dissuade, dehort, cry out against, remonstrate, expostulate,
warn, contraindicate, disincline, indispose, shake, stagger, dispirit, discourage, dishearten, deter, repress, hold back, keep back, render averse, repel, turn aside, wean from, act as a drag, throw cold water on, damp, cool, chill, blunt, calm, quiet, quench, deprecate, disenchant, disillusion, deflate, take down a peg, pop one's balloon, prick one's balloon, burst one's bubble, disabuse (correction).
Warning
VB
warn, caution, forewarn, prewarn, admonish, premonish, give notice, give warning, dehort, menace, put on one's guard, sound the alarm, croak, beware, ware, take warning, take heed at one's peril, keep watch and ward.
Alarm
VB
give the alarm, raise the alarm, sound the alarm, turn in the alarm, beat the alarm, give an alarm, raise an alarm, sound an alarm, turn in an alarm, beat an alarm, alarm,
warn, ring the tocsin, battre la generale, cry wolf.