1. Abate
   Rebate
2. Deflate
   Debate

Just as "amoral" means "not having morality," the prefix works the same way here. For example, "The tsunami came but then the swell abated."

1. Kindly
   Benevolent
2. Noble
   Patronizing

Benevolence is the opposite of malevolence. For example, "It was technically a dictatorship, but under Good Queen Jane, it was a benevolent one."

1. Beautifist
   Aesthete
2. Looker
   Gazer

An aesthete is a person who appreciates beauty. It is usually used to refer to non-human beauty, for example, someone with great taste in interior design.

1. Fornicate
   Fluctuate
2. Obfuscate
   Delicate

The word "fluctuate" has the same root as "fluid." For example, "The market fluctuates wildly when the government is unstable."

1. Sesquipedalian
   Linguist
2. Lexicographer
   Wordsmith

A sesquipedalian loves long words. For example, "If you want to be a successful lexicographer, you probably want to be a sesquipedalian."

1. Contend
   Intend
2. Attend
   Retend

Contend means to compete, but also to assert a claim. For example, "The contender contended that he was here to contend."

1. Expel
   Expose
2. Expand
   Expend

Expending means using up, with an implication of exhausting the supply. For example, "We shall expend no more money in the search for the missing bunny."

1. Scintilliating
   Fabulous
2. Galvanizing
   Energizing

Galvanizing means to coat something in zinc. It also means to motivate someone to act. For example, "Seeing how good she looked after a week, galvanized her to keep up her new workout."

1. Absurd
   Ignominious
2. Insalubrious
   Presposterous

Ignominy is a word that hasn't changed since it was Latin. An example of use: "After his business collapsed, he faced the ignominy of having his tanning bed repossessed."

1. Difference
   Reference
2. Deference
   Inference

Defer means to put off, as in military service. It also means to bow to someone else, as in, "I defer you your opinion."

1. Curate
   Reprobate
2. Cultivate
   Ultimate

Cultivation means growing something, either a relationship or a real thing. For example, "I cultivated John for 10 years before I asked him to invest."

1. Disparage
   Discreet
2. Delicious
   Deluxe

Disparagement means saying mean things about someone. It can mean things that are not true or things that are. For example, "After you leave the company, you have to commit not to disparage it."

1. Egregious
   Outrageous
2. Supercilious
   Smug

If it's bad, then it's just bad. If it's egregious, it's a worst-in-class screw-up. For example, "Putting Legos in the oven in hopes of making them look different was a truly egregious mistake."

1. Bariatric
   Pediatric
2. Geriatric
   Hat trick

Geriatric means of old age. It's also still (for some reason) the word applied to pregnancies occurring in women who are a good 35 years away from being themselves geriatric!

1. Excite
   Recite
2. Incite
   Plebiscite

Inciting is not like just fomenting or exciting. It has a negative connotation. For example, "He incited the crowd to turn against the honest man."

1. Zeroed out
   Null
2. Nonexistent
   Vague

Null means nonexistent or void. For example, "Since he lied on the form, his submission is null."

1. Pine
   Opine
2. Yearn
   Assert

Opining means giving an opinion. However, it also has a connotation of being a bit irritating. For example, "He opined that it wasn't fair that she wouldn't date him after he repeatedly kicked her dog."

1. Nonsense
   Flatulence
2. Repentance
   Nuance

Nuance means shades of grey. For example, "The typical debate on cable news lacks nuance, and is mostly people shouting nonsense."

1. Quantitative
   Qualitative
2. Vegetative
   Informative

Quantity and quantitative have the same root. For example, "It's a quantative method that takes many factors into account."

1. Prince
   Dirigible
2. Principle
   Thought

Principle is not the same word as principal, though they are homophones. An example, "The principal was a woman of principle."

1. Oeuvre
   Personality
2. Type
   Temperament

Temperament means someone's equilibrium. It is a facet of personality but not the same thing.

1. Conceal
   Amuse
2. Unveil
   Transfigure

Unveiling doesn't always mean literally, like a bride. It can also mean revealing, for example, "They unveiled plans for a building in the shape of a banana."

1. Bizarre
   New
2. Unprecedented
   Unique

Precedent means a thing that happened before that provides a guideline on how to react to a thing happening now. Hence, if it is unprecedented, that's the opposite situation.

1. Empirical
   Observable
2. True
   Fact

Empirical and experiment actually share an etymology in Greek, but you have to go way back. An example: "The empirical evidence provided by the milliner pointed toward him having the largest head in the world."

1. Revoke
   Evoke
2. Invoke
   Provoke

Evoking means to call forth, as in a memory. For example, "The shape of the clouds evoked the image of her mother making porridge."

1. Ubiquitous
   Iniquitous
2. Relinquished
   Transcendent

Uber is the German word for over, and ubiquitous has it for a root. For example, "The Uber app has become ubiquitous in many cities."

1. Tactful
   Rude
2. Polite
   Sociable

Tact and honesty are not exact opposites, but tact means knowing when and how to be honest. For example, "It would not be tactful to tell him that his toupee was on backward throughout the​ entire presentation."

1. Invigorate
   Review
2. Spur
   Encourage

Spurs are designed to make horses go faster - that is, to spur them. For example, "Excessive use of your spurs may spur your horse to throw you into a patch of poison ivy."

1. Skills
   Resources
2. Know-how
   Savvy

Savvy is a very useful thing to have; it means you aren't easily bamboozled. For example, "Thanks to his street savvy, he knew that the woman asking him to spare a dollar to fund her software start-up was, in fact,​ a lunatic."

1. Retention
   Detention
2. Attention
   Intention

Retention is the noun that goes with the verb "to retain." It means to keep something. For example, "They moved to Idaho but retained an apartment in Chicago."

1. Promulgate
   Legalize
2. Lawful
   Legislate

Promulgate means to legalize but also to put forth. For example, "He promulgated the idea that the night sky was really a blanket with Christmas tree lights stuck to it."

1. Moldy
   Changey
2. Malleable
   Moldable

Malleable comes from the Latin word for hammer. For example, "Sadly, all politicians are malleable when it comes to their morality."

1. Moneyed
   Lucrative
2. Generous
   Wealthtastic

If it's lucrative, it means you can make a lot of money. For example, "Truly, this is a lucrative proposition."

1. Feasibility
   Possibleness
2. Pragmaticness
   Plausibleness

If it's feasible, that means it's something you could do. For example, "Before we release funds for the bridge, we must complete a feasibility study."

1. Fortify
   Aggress
2. Foment
   Exacerbate

Exacerbating something means to make it worse. An example of correct use would be, "Burning coal is exacerbating global warming."