Antonyms

 Assign is to give; acquire is to take.

Infidelity means unfaithfulness or breach of trust, so its direct opposite is loyalty (faithfulness/devotion). Journey, trip, and cunning are unrelated concepts.

 Normal is ordinary. Peculiar is odd, strange, not normal.

Uncouth means lacking manners, awkward, or crude. Seemly means proper, suitable, or socially acceptable - the direct opposite. Weak and stable are unrelated.

Conclusive means final, decisive, or putting an end to doubt. Indefinite means unclear, vague, or not determined - they are direct opposites. United and agreeing are not true antonyms.

Bauble means a cheap, showy ornament or trinket. Gem means a precious stone of genuine value - they are opposites in terms of worth and authenticity. Truth and untreated are unrelated.

Melody means a pleasant sequence of musical notes. Discord means lack of harmony or conflict between sounds - they are direct musical opposites. Give up, change, and play are not antonyms.

Wrongful means unjust, illegal, or not fair. Righteous means morally right, virtuous, and just. These are direct opposites.

Pursuit means the act of chasing or following someone or something. Retreat means to withdraw or move back, which is the direct opposite action.

Sorrowful means sad, unhappy, or full of grief. Cheerful means full of joy, happy, and positive. These are direct emotional opposites.

 Complete means whole or total. Deficient means lacking and imcomplete.

Deny means to refuse to admit the truth or existence of something. Pledge means to promise or commit formally. When you deny something, you refuse it; when you pledge, you accept it.

Queer means strange, odd, or unusual. Everyday means common, ordinary, or normal - something that happens daily and is not strange. This is the opposite in the context of being normal vs unusual.

Worthy means having value, merit, or excellence. Cheap can mean of poor quality or lacking value, which is the opposite of worthy in terms of value. Base would be an even stronger antonym meaning morally low.

Carefree means free from anxiety or responsibility. Anxious means worried, nervous, or uneasy. These are direct emotional opposites.

Unwritten means not written or recorded. Written means recorded in writing. These are direct opposites regarding the state of being recorded.

Virtue means moral excellence, goodness, or righteousness. Vice means immoral behavior or wickedness. These are direct moral opposites.

Sway can mean to move back and forth or to influence. Stabilise means to make steady or firm. If something is swaying (unstable), stabilising it makes it steady.

Echo is a repetition of sound. Silence is the absence of sound. These are opposites in the context of sound presence.

Wrench means to twist and pull something forcefully, often to damage or remove. Adorn means to decorate or add beauty to. While not perfect opposites, in this context, wrench suggests violent removal while adorn suggests adding beauty.

Ineffectual means not producing the desired effect or lacking power. Convincing means having the power to persuade or compel, which is a reasonable antonym among the options provided. Provident means wise about future needs, and frail means weak (which is actually a synonym, not antonym).

Achieve means to successfully accomplish or complete a goal. Fail is the direct antonym, meaning to not succeed in something. Normal, totally, and fully are not antonyms of achieve.

Disappear means to vanish or cease to be visible. Emerge means to come into view or become visible, which is the direct antonym. Prize, gell (likely garbled), and defeat are not antonyms.