adversarially

With hostile intent

In an adversarial manner—as opponents or rivals rather than collaborators.

The term appears most often in legal and technical contexts: lawyers operate adversarially in court, each side advocating for their client.

In machine learning, adversarial networks train by pitting algorithms against each other: The model was tested adversarially to find weaknesses.

opposition

antagonistically

In an opposing manner

contrarily · resistantly · defiantly · obstructively · counteractively · discordantly · dissenting · contrariety · friction · obstruction

competition

competitively

With intent to outdo

opponents · matchup · contest · challenger · underdog · versus · head-to-head · zero-sum · counterplay · outmaneuvering

hostility

maliciously

With harmful intent

antagonistically · bitterly · resentfully · aggressively · belligerently · pugnaciously · acrimoniously · rancorously · malevolently · enmity

legal

litigiously

In a lawsuit-prone way

counterargument · testimony · cross-questioning · interrogation · prosecution · defense · deposition · impeachment · examination · appeal

testing

robustness

Resistance to failure

red-team · penetration · probing · worst-case · manipulation · evasion · fooling · breaking

Opposites
cooperation vs. opposition

adversariallycooperatively

Acting in partnership

collaboratively · in partnership · jointly · in concert · collegially

friendliness vs. hostility

adversariallyamicably

In a peaceable manner

cordially · friendlily · warmly · congenially · genially

harmony vs. conflict

adversariallycooperatively

Acting in partnership

collaboratively · harmoniously · amicably · peacefully · agreeably

Phrases
Family

adversarial

Familiarity
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Used worldwide · Timeless · Abstract · Negative · Rated G