Mercurial (adjective) Subject to sudden, unpredictable changes in mood.
Example: Her mercurial temper meant coworkers never knew if she'd greet them warmly or coldly.
Mnemonic: Named after the swift, shifting messenger god Mercury — a mercurial person's mood changes just as fast as the god could move.
Misanthrope (noun) A person who dislikes or distrusts people in general.
Example: The old misanthrope moved to a cabin in the woods specifically to avoid his neighbors.
Mnemonic: Greek 'misos' (hatred) plus 'anthropos' (human) — a misanthrope more or less hates humanity as a whole.
Mitigate (verb) To make a harmful or serious situation less severe.
Example: Wearing a helmet won't prevent every injury, but it can mitigate the damage in a crash.
Mnemonic: Rooted in Latin 'mitis,' meaning mild — to mitigate something is to make it milder.
Mollify (verb) To calm someone's anger or soothe hurt feelings, often with a concession.
Example: The airline offered a free upgrade to mollify the passengers stuck on the delayed flight.
Mnemonic: From Latin 'mollis,' soft — to mollify someone is to soften their anger.
Morose (adjective) Gloomy, sullen, and unwilling to be cheerful.
Example: He'd been morose ever since the team lost the championship game.
Mnemonic: From Latin 'morosus,' meaning sullen or peevish — a morose person wears that sullen mood right on their face.
Multifaceted (adjective) Having many different sides, qualities, or aspects.
Example: The novel's multifaceted protagonist is charming in one chapter and ruthless in the next.
Mnemonic: 'Multi-' (many) plus 'facet' (a cut surface of a gem) — a multifaceted person sparkles with many different facets, like a cut diamond.
Mundane (adjective) Ordinary and unremarkable, belonging to the routine of everyday life.
Example: Folding laundry and washing dishes are mundane chores that nobody looks forward to.
Mnemonic: Comes from 'mundus,' Latin for 'world' — mundane things belong to the ordinary, everyday world rather than anything extraordinary.
Myopic (adjective) Focused only on immediate concerns while ignoring the bigger picture; literally, nearsighted.
Example: Critics called the plan myopic because it solved this year's budget shortfall while creating a bigger one for next year.
Mnemonic: In an eye doctor's office, 'myopia' means nearsightedness — a myopic thinker can only see what's close, never what's coming down the road.
Myriad (adjective) Extremely numerous, so many that counting them all would be impractical.
Example: The night market featured myriad small stalls, each one selling something different.
Mnemonic: Comes from a Greek word for 'ten thousand' — myriad describes a number so large it might as well be ten thousand.
Nefarious (adjective) Extremely wicked or villainous.
Example: The cartoon villain hatched a nefarious plan to steal the town's water supply.
Mnemonic: From Latin 'nefas,' a crime against divine law — nefarious deeds are wicked at the deepest possible level.
Nonchalant (adjective) Coolly unconcerned or casual, as if nothing could bother you.
Example: She gave a nonchalant shrug when told her flight had been cancelled.
Mnemonic: French roots: 'non' (not) plus 'chaloir' (to be concerned) — nonchalant literally means 'not concerned.'
Noxious (adjective) Harmful or poisonous, especially describing a substance or fume that damages health.
Example: The factory released a noxious cloud of smoke that forced nearby residents to shut their windows.
Mnemonic: Think of the 'nox' hiding inside the word, the same root found in 'toxic' — noxious fumes are basically toxic air.
Nuance (noun) A small, subtle distinction in meaning, tone, or expression.
Example: The translator worked hard to preserve every nuance of the original poem.
Mnemonic: From French 'nuer,' to shade colors — a nuance is a subtle shading of meaning, like one color blending into the next.
Nullify (verb) To make something legally or officially without effect; to cancel it out.
Example: The court moved to nullify the contract after discovering it had been signed under duress.
Mnemonic: Contains 'null,' meaning zero or nothing — to nullify is to reduce something down to nothing.
Obdurate (adjective) Stubbornly refusing to change one's mind or soften one's position.
Example: Despite hours of pleading, the landlord remained obdurate about the rent increase.
Mnemonic: Latin 'durus' means hard (as in 'durable') — an obdurate person has a will as hard and unyielding as stone.
Obliterate (verb) To destroy something so completely that no trace of it remains.
Example: The wildfire obliterated the small mountain town within hours.
Mnemonic: From Latin 'littera,' letter — to obliterate originally meant to blot out letters on a page until nothing was left legible.
Oblivious (adjective) Completely unaware of what's happening nearby.
Example: Absorbed in his headphones, he was oblivious to the fire alarm blaring down the hallway.
Mnemonic: Shares a root with 'oblivion,' a state of being forgotten — someone oblivious has mentally checked out, missing everything around them.
Obstinate (adjective) Stubbornly sticking to an opinion or course of action despite pressure to change.
Example: The obstinate toddler refused to wear anything but his dinosaur costume for a week.
Mnemonic: Shares the Latin root 'stare' (to stand) with 'obstacle' — an obstinate person plants their feet and stands firm, an obstacle no one can budge.
Ominous (adjective) Giving the unsettling feeling that something bad is about to happen.
Example: The sky turned an ominous shade of green just before the tornado sirens went off.
Mnemonic: Shares a root with 'omen,' a sign of things to come — ominous clouds feel like a bad omen rolling in.
Opaque (adjective) Not able to be seen through; by extension, difficult to understand or interpret.
Example: The company's opaque pricing policy left customers unsure what they were actually being charged for.
Mnemonic: Picture a solid oak door: light can't pass through it, just as understanding can't pass through something opaque.
Opulent (adjective) Displaying great and often showy wealth; luxurious.
Example: The hotel lobby was opulent, with marble floors and gold-trimmed chandeliers.
Mnemonic: Related to Latin 'ops,' meaning wealth or resources (also seen in 'copious') — opulent places overflow with riches.
Ostentatious (adjective) Showing off wealth or achievement in a way meant to impress or draw attention.
Example: He drove the most ostentatious car in the parking lot, just to make sure everyone noticed.
Mnemonic: Contains 'ostent-,' related to Latin 'ostendere,' to show — ostentatious behavior is all about showing off.
Ostracize (verb) To deliberately exclude someone from a group or community.
Example: After the scandal broke, his former teammates began to ostracize him at every practice.
Mnemonic: In ancient Athens, citizens voted to banish someone by scratching a name onto a broken pottery shard called an 'ostrakon' — to ostracize is to vote someone out of the group.
Painstaking (adjective) Done with great care and thoroughness, sparing no effort.
Example: Restoring the old painting required painstaking work under a magnifying glass.
Mnemonic: Literally 'taking pains' — painstaking effort means being willing to endure the pains, the hard work, needed to get something right.
Paradox (noun) A statement or situation that seems to contradict itself yet may still hold some truth.
Example: "You have to spend money to make money" is a classic paradox that confuses new business owners.
Mnemonic: 'Para-' (contrary to) plus 'dox' (opinion, as in 'orthodox') — a paradox runs contrary to the opinion we'd normally expect.