1 baleful, baneful, calamitous, cataclysmic, catastrophic, damaging, deadly, deleterious, detrimental, devastating, fatal, harmful, hurtful, injurious, lethal, maleficent, noxious, pernicious, ruinous
2 adverse, antagonistic, contrary, derogatory, discouraging, discrediting, disparaging, hostile, invalidating, negative, opposed, undermining, vicious
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"