"Plasticity" refers to the ability of a material to be shaped or molded. The opposite would be "stiff," meaning rigid or inflexible.

Opposite words: Stiffness, Rigidity, Inflexibility, Obstinacy, Cogency.

"Tribute" refers to an expression of respect, admiration, or gratitude. The opposite would be "denunciation," which refers to public condemnation or criticism.

Opposite words: Indictment, Censure, Rebuke, Reprimand, Denunciation.

"Ransack" means to search through something in a way that causes damage or disorder, often with the intent to steal. The opposite would be "guard," meaning to protect or keep safe.

Opposite words: Abandon, Hide, Guard.

"Perish" means to die or be destroyed. The opposite would be "survive," meaning to continue to live or exist.

Opposite words: Exist, Live, Breathe, Thrive.

"Frugal" refers to being careful with money or resources, spending little. The opposite would be "extravagant," meaning wasteful or excessive in spending.

Opposite words: Bountiful, Charitable, Extravagant, Lavish, Prodigal, Wasteful.

"Asperity" refers to harshness of tone or manner, especially in speech. The opposite would be "mildness of temper," meaning a gentle or calm demeanor.

Opposite words: Politeness, Cordiality, Geniality, Urbanity.

"Placate" means to calm or appease someone, especially to reduce their anger. The opposite would be "antagonize," which means to provoke or stir up hostility.

Opposite words: Anger, Infuriate, Enrage, Antagonize.

"Repine" means to feel or express discontent or unhappiness. The opposite would be "express joy," meaning to feel or show happiness or pleasure.

Opposite words: Accept, Delight, Endure, Rejoice, Tolerant.

"Protagonist" refers to the main character in a story, usually a hero or central figure. The opposite would be "opponent," referring to someone who is against or in opposition to the protagonist.

Opposite words: Antagonist, Adversary, Competitor, Opponent, Rival.

"Vacillate" means to be indecisive or waver between options. The opposite would be "conclude," which means to come to a decision or finish a thought or process.

Opposite words: Proceed, Advance, Decide, Conclude.