eu

Eu is one of the friendliest pieces of Greek you can learn: it simply means "good, well, true." In ancient Greek, eu was the everyday word for doing something well — speaking well, sounding well, dying well. As a prefix it never stands alone; it always clamps onto another Greek root and gives the whole word a positive spin. Learn eu, and a cluster of intimidating words suddenly become readable.

The pattern is always the same: eu- (good) + [what is being done well]. Three classic examples show the machine at work:

- euphemism = eu- (good) + phēmi (speak) + -ism = "good-speaking." When you can't bear to say the harsh thing, you reach for a gentler substitute: "passed away" instead of "died," "let go" instead of "fired." The euphemism is the nicely-spoken version.
- eulogy / eulogize = eu- (good) + logos (word) = "good words." A eulogy is the praise spoken about a person, classically over the dead at a funeral; to eulogize is to deliver those good words.
- eucalyptus = eu- (good, well) + kalyptos (covered) = "well-covered." The Australian tree got its name because each flower bud wears a tidy little cap that "covers it well" before it opens.

Once the eu- machine clicks, the family keeps growing, and you can decode each new word on sight:

- euphoria = eu- + pherein (to bear) = "bearing well" → a feeling of intense well-being.
- euphonious = eu- + phōnē (sound) = "good-sounding" → pleasant to the ear.
- euthanasia = eu- + thanatos (death) = "good death" → a gentle, painless ending.
- eugenics = eu- + genos (birth, kind) = "good birth" → the (now discredited) idea of improving a population by controlled breeding.

Even names carry it: Eugene literally means "well-born," and Eunice means "good victory."

The cleanest way to lock eu- in is to learn its opposites. Greek had dys- (bad, faulty) and caco- (ugly, harsh) as its dark mirrors: euphemism vs dysphemism (deliberately offensive wording), euphony vs cacophony (harsh, jarring noise), eugenics vs dysgenics. Wherever you meet eu-, picture dys- standing on the other side. Good vs bad, and the rest of the word stays exactly the same.