Synonyms of detrimental

1 Syllable
bad, ill
2 Syllables
wreckful, septic, harmful, noxious, evil, naysaying, coner, nocent, nocuous, maligns, malign, dickens, hurtful
3 Syllables
pernicious, adverse, baleful, malefic, disturbing, unhealthful, injurious, mischievous, malicious, toxicant, damaging, rascally, dissentient, poisonous, pestilent, miasmatic, maligning
4 Syllables
lethiferous, negative, inexpedient, ill-behaved, prejudicial, inconvenient, incommodious, deleterious, privative, maleficent, inimical, destructive, mephitical, discommodious, prejudicious
5 Syllables
extirpative, unconducive, unfavorable
6 Syllables
counterproductive, eradicative, unaffirmative