angry clouds, black cat, black clouds, blackening, blocking the light, breakers ahead, broken mirror, cardhouse, cause for alarm, clouding, crisis, danger, danger sign, dangerous ground, darkening, dimming, early symptom, eclipsing, emergency, endangerment, extinguishment, falling barometer, gaping chasm, halcyon bird, hazard, high sign, house of cards, imperilment, jeopardy, menace, obfuscation, obnubilation, obscuration, obscurement, obumbration, occulting, omen, overcast, overclouding, overshading, overshadowing, overshadowment, owl, pass, peril, pinch, plight, precursor, predicament, preliminary sign, premonitory sign, premonitory symptom, prodroma, prodrome, quarantine flag, quicksand, rainbow, raven, red flag, red light, risk, rocks ahead, shading, shadowing, shooting star, skull and crossbones, storm clouds, storm petrel, stormy petrel, strait, symptom, thin ice, threat, thundercloud, thunderhead, warning sign, warning signal, yellow flag, yellow jack
warning, early warning, caution, caveat, notice, premonition, premonishment, prediction, contraindication, lesson, dehortation, admonition, monition, alarm, handwriting on the wall, mene mene tekel upharsin, red flag, yellow flag, fog-signal, foghorn, siren, monitor, warning voice, Cassandra, signs of the times, Mother Cary's chickens, stormy petrel, bird of ill omen, gathering clouds
, clouds in the horizon, death watch, watchtower, beacon, signal post, lighthouse, sentinel, sentry, watch, watchman, watch and ward, watchdog, bandog, housedog, patrol, patrolman, vedette, picket, bivouac, scout, spy, spial, undercover agent, mole, plainclothesman, advanced guard, rear guard, lookout, cautiousness, monitor, guard camera, radar, AWACS, spy satellite, spy-in-the- sky, U2 plane, spy plane, warning, premonitory, monitory, cautionary, admonitory, admonitive, sematic, warned, forewarned, on one's guard, in terrorem, Int, beware!, ware!, take care!, look out!, fore (golf), mind what you are about!, take care what you are about!, mind!, ne reveillez pas le chat qui dort, don't wake a sleeping cat, foenum habet in cornu, caveat actor, le silence du people est la legon des rois, verbum sat sapienti, a word to the wise is sufficient, un averti en vaut deux.
adversity, evil, failure, bad luck, ill luck, evil luck, adverse luck, hard fortune, hard hap, hard luck, hard lot, frowns of fortune, evil dispensation, evil star, evil genius, vicissitudes of life, ups and downs of life, broken fortunes, hard case, hard lines, hard life, sea of troubles, peck of troubles, hell upon earth, slough of despond, trouble, hardship, curse, blight, blast, load, pressure, pressure of the times, iron age, evil day, time out of joint, hard times, bad times, sad times, rainy day, cloud, dark cloud, gathering clouds
, ill wind, visitation, infliction, affliction, bitter pill, care, trial, the sport of fortune, mishap, mischance, misadventure, misfortune, disaster, calamity, catastrophe, accident, casualty, cross, reverse, check, contretemps, rub, backset, comedown, setback, losing game, falling, fall, downfall, ruination, ruinousness, undoing, extremity, ruin, unfortunate, unblest, unhappy, unlucky, improsperous, unprosperous, hoodooed, luckless, hapless, out of luck, in trouble, in a bad way, in an evil plight, under a cloud, clouded, ill off, badly off, in adverse circumstances, poor, behindhand, down in the world, decayed, undone, on the road to ruin, on its last legs, on the wane, in one's utmost need, planet-struck, devoted, born under an evil star, born with a wooden ladle in one's mouth, ill-fated, ill-starred, ill-omened, adverse, untoward, disastrous, calamitous, ruinous, dire, deplorable.
threat, menace, defiance, abuse, minacity, intimidation, denunciation, fulmination, commination, gathering clouds
, threatening, menacing, minatory, minacious, comminatory, abusive, in terrorem, ominous, defiant, under the ban, Int, vae victis!, at your peril!, do your worst!.
omen, portent, presage, prognostic, augury, auspice, sign, harbinger, yule candle, bird of ill omen, signs of the times, gathering clouds
, warning, prefigurement, ill-boding, auspicium melioris aevi.