ef-ih-KAY-shus
(adjective) Effective in producing the desired result.
The vaccine proved highly efficacious in preventing disease.
Fun Fact
While “effective” and “efficacious” are similar, the latter is usually used in formal, academic, or scientific contexts. For instance, in pharmaceutical trials, a drug must be “efficacious” before it can be deemed “effective” for general use. It’s a favorite in public health and policy.
ef-ih-KAY-shus
(adjective) Effective in producing the desired result.
The vaccine proved highly efficacious in preventing disease.
Fun Fact
While “effective” and “efficacious” are similar, the latter is usually used in formal, academic, or scientific contexts. For instance, in pharmaceutical trials, a drug must be “efficacious” before it can be deemed “effective” for general use. It’s a favorite in public health and policy.
boon
(noun) A thing that is helpful or beneficial.
The new community center was a boon to families in the neighborhood.
Fun Fact
Originally associated with blessings or requests in Old English and Norse mythology, a “boon” once referred to a favor granted by a king or god. Today, it’s still used to describe anything that feels like a fortunate benefit—whether it’s a job perk, a technological breakthrough, or a surprise day off.
MAW-kish
(adjective) Overly sentimental or emotional to the point of being unpleasant.
The movie’s mawkish ending drew eye-rolls rather than tears.
Fun Fact
Mawkish originally referred to a nauseating or spoiled taste, stemming from the Middle English mauk, meaning “maggot.” Over time, the meaning shifted from physical disgust to emotional excess. Today, it’s used to describe songs, movies, or writing that lay on the sentiment so thick it turns people off.
REK-ti-tood
(noun) Morally correct behavior or thinking; righteousness.
Her rectitude was admired even by her fiercest opponents.
Fun Fact
Rectitude is an old-school word that appears in documents like the U.S. Declaration of Independence, which refers to “a decent respect to the opinions of mankind” and “the rectitude of our intentions.” It comes from Latin rectus, meaning “straight” or “right,” and it’s often used to describe people with uncompromising principles.
TAS-i-turn
(adjective) Reserved or uncommunicative in speech.
The taciturn detective revealed little, even under pressure.
Fun Fact
Taciturn comes from the Latin taciturnus, meaning “not talkative.” It often appears in literature to describe mysterious or stoic characters—think Clint Eastwood’s cowboy or Mr. Darcy from Pride and Prejudice. Unlike shy or introverted, taciturn implies intentional silence, not just social discomfort.
ahn-WEE
(noun) A feeling of weariness or dissatisfaction from lack of excitement.
Despite his wealth, ennui plagued him in retirement.
Fun Fact
Ennui gained literary popularity in the 19th century, especially among Romantic and existential writers like Baudelaire and Flaubert. Unlike boredom, which can be fleeting, ennui suggests a deeper, more existential discontent. It’s often tied to periods of great privilege or monotony—when all needs are met but meaning is still elusive.