Merriam-Webster Online Dictionary
dangerous (adjective)1.
exposing to or involving - danger a dangerous job
2.
able or likely to inflict injury or harm - a dangerous man
Merriam-Webster Online Thesaurus
dangerous (adjective)1.
involving potential loss or injury
SYNONIMS:
grave, grievous, hazardous, jeopardizing, menacing, parlous, perilous, risky, serious, threatening, unhealthy, unsafe, venturesomeRELATED WORDS:
dicey, insecure, precarious, treacherous, uncertain; ultrahazardous; chance, haphazard, random; distressing, sickening, unpleasant; ugly, wicked; adverse, bad, baleful, baneful, deleterious, detrimental, evil, harmful, hurtful, ill, inimical, injurious, malignant, nasty, noxious, pernicious, pestilent; deadly, deathly, destructive, dire, fatal, fateful, fell, killer, lethal, mortal, murderousNEAR ANTONYMS:
advantageous, beneficial, good; ultrasafe2.
causing or capable of causing harm
SYNONIMS:
adverse, bad, baleful, baneful, damaging, dangerous, deleterious, detrimental, evil, hurtful, ill, injurious, mischievous, nocuous, noxious, pernicious, prejudicial, wickedRELATED WORDS:
hostile, inimical, unfriendly; contagious, deadly, infectious, infective, pestiferous, pestilent, pestilential, poisonous, venomous; insidious, menacing, ominous, sinister, threatening; hazardous, imperiling ( imperilling), jeopardizing, parlous, perilous, risky, unsafe, unsound; nasty, noisome, unhealthful, unhealthy, unwholesome; destructive, fatal, killer, lethal, malignant, ruinousNEAR ANTONYMS:
advantageous, beneficial, useful; favorable, good, propitious; curative, healthful, healthy, helpful, palliative, remedial, salubrious, salutary, wholesome; secure, sound; benignant; noncorrosive, nondestructive, nonfatal, noninfectious, nonlethal, nonpoisonous, nonpolluting, nontoxic, nonvenomous