Synonyms of disadvantageous

2 Syllables
harmful, nocent, slighting, scrapper, hurtful
3 Syllables
adverse, ill-timed, injurious, contrary, debit-side, downside, damaging, useless, mistimed, detracting
4 Syllables
inutile, unusable, inexpedient, prejudicial, dyslogistic, inconvenient, incommodious, deleterious, nonfunctional, discommodious, disparaging, unfunctional, unusuable, discouraging
5 Syllables
depreciative, objectionable, unconducive, unfavorable, depreciatory, inopportune, pejorative, unprofitable, derogatory
6 Syllables
counterproductive, uncomplimentary