unfavorable

adj

1.
not encouraging or approving or pleasing
unfavourable
Antonym:
favorable
Derived from:
unfavorableness
2.
(of winds or weather) tending to hinder or oppose
unfavourable
Antonym:
favorable
Derived from:
unfavorableness
3.
involving or creating circumstances detrimental to success or effectiveness
hindered thwart wither disadvantageous unfavourable
Derived from:
unfavorableness