Unfavorable; antagonistic in purpose or effect; hostile; actively opposing one's interests or wishes; contrary to one's welfare; acting against; working in an opposing direction.

In an adverse manner.

The state or quality of being adverse, or opposed.

(rare or non-standard) Comparative form of adverse: more adverse.

plural of adverseness

plural of adversity

(linguistics) Expressing opposition or difference. / (linguistics) Expressing adverse effect.

(rare, dated) Something, particularly a clause or conjunction, which is adversative.

plural of adversative

In an adversative manner