un advantageous (adjective) unadvantageous: unfavorable
Sinonime: adverse,
antagonistic,
calamitous,
contrary,
damaging,
destructive, disadvantageous, discommodious,
hostile,
ill, ill-advised,
improper, inadvisable,
inauspicious,
inconvenient, inexpedient, infelicitous,
inimical, inopportune,
late,
low, malapropos,
negative, objectionable,
ominous,
opposed,
poor, regrettable,
tardy,
threatening,
troublesome, unfit,
unfortunate,
unfriendly,
unlucky, unpromising, unpropitious,
unsatisfactory, unseasonable, unseemly, unsuited, untimely, untoward,
wrong