(uncountable) The state of adverse conditions; state of misfortune or calamity. / (countable) An event that is adverse; calamity.

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.

plural of adverseness

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

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

plural of adversative

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

In an adversative manner

plural of adversity

In an adverse manner.