noxious(redirected from noxious gases)
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adj. harmful to health, often referring to nuisances.
noxiousadjective adverse, bad, baleful, baneful, brutal, causing danger, contaminated, corrupting, dangerous, deleterious, destructive, detrimental, fatal, fraught with danger, harmful, hazardous, hurtful, injurious, insalubrious, internecine, lethal, malefic, malicious, malignant, menacing, mischievous, nocent, noisome, offensive, perilous, pestiferous, pestilent, poisonous, precarious, risky, ruinous, scatheful, threatening, toxic, unfavorable, unhealthy, unsafe, unwholesome, vicious, virulent
See also: bad, contemptible, deadly, deleterious, detrimental, fatal, harmful, harsh, inferior, inimical, insalubrious, lethal, malignant, objectionable, obnoxious, peccant, pernicious, pestilent, repulsive, sinister, tainted, toxic, unfavorable, virulent