Antonyms

Essential means absolutely necessary or indispensable, which is the opposite of redundant (unnecessary, superfluous, or surplus). Consistent means steady, complex means complicated, diffuse means spread out, and insightful means perceptive - but essential directly contrasts with the dispensability implied by redundant.

Unity means the state of being joined as a whole, which is the opposite of partition (division into parts). Mollify means to soothe, nullify means to cancel, indemnity means compensation, and fortification means defense - but unity directly contrasts with the separateness implied by partition.

 Cardinal means major or fundamental.  Therefore minor is directly opposite in meaning.

Expel means to force out or eject, which is the opposite of ingest (to take in or swallow). Digest means to break down food, take along means to bring with, encourage means to inspire, and deter means to discourage - but expel directly reverses the action of taking something in.

Augment means to make greater, more intense, or to increase, which is the opposite of abate (to become less intense or to diminish). Attach means to connect, alter means to change, absent means missing, and assist means to help - but augment directly reverses the reduction implied by abate.

Neglect means to fail to give proper attention to or disregard, which is the opposite of consider (to think carefully about or give attention to). Activate means to turn on, infer means to deduce, table means to postpone, and encourage means to inspire - but neglect directly contrasts with the careful attention that consider implies.

Shallow means lacking depth, either physically (like shallow water) or metaphorically (like shallow thinking). Profound means having great depth, insight, or seriousness, making it the direct opposite.

Mercurial describes someone or something that is changeable, volatile, or unpredictable (like the liquid metal mercury). Constant means staying the same or unchanging, which is the direct opposite.

Propagate means to spread, promote, multiply, or extend something (like ideas, plants, or signals). To annul means to cancel, revoke, or declare invalid, which opposes the concept of spreading or continuing something.

An accolade is an award, honor, or praise given to acknowledge achievement. Criticism is the expression of disapproval or negative judgment, making it the opposite of giving praise or honor.

Viscid means sticky, adhesive, or having a thick glue-like consistency. Loose means not firmly or tightly attached, which is the opposite of something that is sticky or adhesive.

A warmonger is someone who advocates or promotes war and conflict. A pacifist is someone who opposes war and advocates for peaceful resolution, making them direct opposites.

A savant is a learned person, especially someone with detailed knowledge in a specialized field. Unlearned means lacking knowledge or education, which is the opposite of being knowledgeable or scholarly.

Adhere means to stick to, remain attached to, or follow closely (like adhering to rules). Detach means to separate or disconnect, which is the direct opposite of attaching or sticking to something.

Steep, when referring to prices or quantities, means to soak or immerse, but can also mean to increase sharply. Plummet means to fall or drop rapidly, which opposes the idea of rising or increasing sharply.

Pinch can mean a small amount or scarcity (as in "a pinch of salt" or "in a pinch" meaning barely enough). Abundant amount means plentiful or copious, which is the opposite of a small or meager amount.

Hyperbole is exaggerated statements or claims not meant to be taken literally. Understatement is the deliberate presentation of something as smaller or less important than it actually is, making it the direct opposite.

Aver means to state or assert to be true, to affirm confidently. Deny means to declare untrue or refuse to admit, which is the direct opposite of affirming or asserting something.

Supine means lying face up or metaphorically lazy/indifferent. Vigilant means being watchful and alert, which is the opposite of a supine attitude.

Extemporaneous means unplanned, therefore planned is correct.

Tranquility means being calm, peaceful, and free from disturbance. Pandemonium means wild and noisy disorder or chaos, making it the direct opposite.

Flourish means to grow well, thrive, or be in a state of active growth. 'Lack of substance' suggests emptiness or hollowness, which is the opposite of flourishing with substance.