Unfavorable; negative; not good.
Good, superlative, excellent, cool.
Not covered by funds on account.
Not suitable or fitting.
Not appropriate, of manners etc.
Spoiled, rotten, overripe.
Bold and daring.
Malodorous; foul.
Stop being bad, or you will get a spanking!
Unskilled; of limited ability; not good.
Unhealthy; liable to cause health problems.
Of poor physical appearance.
False; counterfeit; illegitimate.
Not behaving; behaving badly; misbehaving; mischievous or disobedient.
Evil; wicked.
Severe, urgent.
Overly promiscuous, licentious.
Very attractive; hot, sexy.
Faulty; not functional.
Tricky; stressful; unpleasant.
Sickly, unhealthy, unwell.
Used to scold a misbehaving child or pet.
To shell (a walnut).
Something that is bad; a harm or evil.
Error; mistake.
An item (or kind of item) of merchandise with negative value; an unwanted good.
Badly.
Opposed; contradictory; inconsistent.
Opposite; in an opposite direction; in opposition; adverse.
Given to opposition; perverse; wayward.
Contrarily
One of a pair of propositions that cannot both be simultaneously true, though they may both be false.
The opposite.