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Suffixes (-적, -화, -성, -률) — Four Endings That Build Formal Korean
The first article in this series listed a handful of endings in a table and moved on. This one comes back to four of them, because they behave differently from ordinary vocabulary.
They are productive. A Korean word ending in 적, 화, 성 or 률 was not necessarily learned as a unit by the person who wrote it — it was assembled on the spot, out of a noun plus an ending, the way an English writer produces containerisation without having read it anywhere. Which means you will meet combinations that are in no beginner word list, and you’ll still be expected to read them.
Four endings, four jobs.
-적 — makes a noun into a description
경제 is the economy. 경제적 is economic. The ending does roughly what English -ic and -al do, and it attaches to abstract nouns of the kind the last article was about.
What matters is that it takes four shapes depending on where it sits in the sentence:
| Shape | Job | Example |
|---|---|---|
| -적 + noun | modifies a noun (written, compact) | 경제적 효과 — economic effect |
| -적인 + noun | modifies a noun (the everyday form) | 현실적인 방법 — a realistic method |
| -적으로 | modifies a verb, like -ly | 적극적으로 참여하다 — participate actively |
| -적이다 | ends the sentence | 그 계획은 비현실적이다 — that plan is unrealistic |
If you take one thing from this section, take -적으로. It is an adverb marker, and adverbs are skippable. Seeing it lets you jump straight to the verb and read the sentence’s spine first.
The ones you’ll meet constantly:
사회적 · 경제적 · 정치적 · 구체적 · 일반적 · 기본적 · 대표적 · 적극적 · 긍정적 · 부정적 · 효과적 · 지속적 · 세계적
Note the pairs that are simply opposites — 긍정적 (positive) and 부정적 (negative) — which is a free doubling every time you learn one.
-화 — the process of becoming
세계 is the world; 세계화 is globalisation. English -ization, near enough exactly.
The useful part is what you do with it after. -화 produces a noun, so to make something happen you attach a verb to it:
- 자동화 — automation
- 자동화되다 — to be automated, to become automated
- 자동화하다 — to automate
This ending is the clearest proof that these are live, working parts rather than fossils: it attaches happily to loanwords. 디지털화 and 온라인화 are ordinary words, built from an English root and a Sino-Korean ending.
In the news you’ll see it describing every large slow change:
고령화 (ageing) · 도시화 (urbanisation) · 민영화 (privatisation) · 온난화 (warming) · 정상화 (normalisation) · 활성화 (revitalisation) · 다양화 (diversification)
고령화 사회 — an ageing society — is worth having ready. It is one of the most frequent phrases in Korean domestic reporting.
-성 — the quality of being
가능 is possible; 가능성 is possibility. This is English -ness and -ity.
가능성 · 필요성 · 안전성 · 중요성 · 신뢰성 · 투명성 · 다양성 · 형평성
One collocation to pick up with it, because a direct translation from English lands awkwardly. A possibility in Korean is high or big — reach for those rather than many:
- 가능성이 높다 — the possibility is high ✓
- 가능성이 크다 — the possibility is big ✓
There’s also a near neighbour worth separating now rather than later. -성 is a property something has; -감 is a feeling someone gets:
| Word | Ending | Means |
|---|---|---|
| 안정성 | -성 | stability, as a measurable property |
| 안정감 | -감 | a feeling of stability, a sense of security |
| 책임감 | -감 | a sense of responsibility |
A bridge has 안정성. A person feels 안정감.
-률 / -율 — the rate, and the one spelling rule
This one is the reason the article exists, because it is the only ending of the four that changes its spelling, and the change is not random.
The ending means rate or ratio. It is written -율 after a vowel or after a ㄴ 받침, and -률 everywhere else.
| Preceding sound | Form | Examples |
|---|---|---|
| a vowel | -율 | 비율 (ratio), 투표율 (turnout), 지지율 (approval rating), 증가율 (growth rate), 점유율 (market share) |
| ㄴ 받침 | -율 | 출산율 (birth rate), 환율 (exchange rate), 백분율 (percentage) |
| anything else | -률 | 실업률 (unemployment rate), 성장률 (growth rate), 사망률 (mortality), 합격률 (pass rate), 시청률 (viewership), 확률 (probability) |
The pair that proves the rule is real:
- 출산율 — 산 ends in ㄴ, so 율.
- 출생률 — 생 ends in ㅇ, so 률.
Two words about births, in the same newspaper, spelled differently — and not because anyone is being inconsistent. The sound in front decides it.
This is not a cosmetic detail. It decides whether your search returns anything, and it turns up in headlines more than almost any other formal ending, because news is largely about numbers going up and down.
Reading them in the wild
Once the four are in place, long formal nouns come apart on sight:
- 실업률 = 실업 (unemployment) + 률 → unemployment rate
- 고령화 = 고령 (advanced age) + 화 → population ageing
- 지속가능성 = 지속 (continuing) + 가능 (possible) + 성 → sustainability
- 비현실적 = 비- (not) + 현실 (reality) + 적 → unrealistic
That last one adds a bonus part: 비- at the front is a negating prefix, the same one in 비공개 (undisclosed) and 비정규직 (non-regular employment).
The honest limit
You can decode nearly any word you meet that ends in these four. You cannot freely invent them.
Korean accepts a settled set of combinations, and a grammatically sensible one you assembled yourself may simply not be a word — the same way unpossible is transparent in English and still wrong. Recognition is where the return is; production comes later, from having seen the combinations that actually occur.
So treat this as a reading tool. Then go and use it: open a recent daily edition and look at the long nouns in the economy and society articles. Cut off the last syllable, and see whether the part in front is a word you already know.