adversas

Adversas is the feminine plural form of the adjective adverso in Portuguese and Spanish, meaning unfavorable, harmful, or hostile. It is used to describe conditions, effects, or circumstances that hinder outcomes or pose difficulties, and it can also relate to opposition or an adversary in a general sense. The term derives from Latin adversus, meaning turned toward or opposed.

In usage, adversas agrees in gender and number with feminine plural nouns. Examples include Portuguese phrases such as condições adversas (adverse conditions), efeitos adversos (adverse effects; note that in Portuguese the noun "efeitos" is masculine, so the adjective commonly appears as adversos in that phrase), and circunstâncias adversas. In Spanish, frases like situaciones adversas (adverse situations) and condiciones adversas are common. In both languages, adversas typically contrasts with favorable or beneficial terms (condiciones favorables, situaciones beneficiosas).

Adversas is primarily an adjective. It is not generally used as a standalone noun in everyday language, though discussions of “adversas” factors or elements are possible in formal or technical writing when the feminine plural noun is implied from context. The term also appears in broader semantic fields to convey opposition or hostility, similar to the English cognate “adverse” and its use in phrases like adverse weather, adverse conditions, or adverse effects.

See also: Adverso/adversa, adversario/adversaria, adversaries (in English usage).