German adjective endings — the system nobody teaches well
Most German courses present adjective endings as three tables to memorise. That works — but it is slow and fragile. This page teaches the underlying rule first, then shows the tables as a confirmation of what you already understand.
TL;DR
Every German noun phrase gets exactly one strong gender/case marker. If the article already carries it, the adjective uses a weak ending (-e or -en). If there is no article (or a gender-ambiguous one), the adjective takes the strong ending. This is the one-strong-marker rule.
Why adjective endings feel impossible
There are 48 cells across three tables. But count the distinct endings: roughly 80% of cells are either -e or -en. The "strong" endings — the ones that carry gender and case information — only appear in a small set of predictable slots. The problem is not the number of endings; it is that most courses do not explain why those slots are where they are.
Learn the rule first, then look at the tables. With the rule, each cell is a logical consequence rather than a separate item to memorise. The tables become a quick-check reference, not 48 facts to recall under pressure.
A second common confusion: many learners add endings to adjectives that come after sein or werden — the so-called predicate adjectives. Those never inflect. The distinction between attributive (before noun) and predicate (after sein) is explained explicitly below.
The one-strong-marker rule
Every noun phrase gets exactly one strong gender/case marker — the article carries it, or the adjective does. Never both, never neither.
Article present
der alte Mann
"der" carries the strong signal → adjective takes weak -e ending
No article
alter Mann
No article → adjective must take the strong -er ending itself
Indefinite article (masc Nom)
ein alter Mann
"ein" is gender-ambiguous here → adjective takes strong -er to signal masculine
Table 1 — After definite article
The definite article (der/die/das/den/dem/des) always shows the full case and gender signal. The adjective job is done — it just adds a weak ending: -e in Nominativ and selected Akkusativ forms, -en everywhere else.
| Case | Masculine | Feminine | Neuter | Plural |
|---|---|---|---|---|
| Nominativ | -e | -e | -e | -en |
| Akkusativ | -en | -e | -e | -en |
| Dativ | -en | -en | -en | -en |
| Genitiv | -en | -en | -en | -en |
Example: der große Hund / die große Katze / das große Haus
After the definite article — the article already shows the case, so the adjective takes a weak ending.
Table 2 — After indefinite article
"ein" is gender-ambiguous: "ein Buch" could be masculine or neuter, and "ein Mann" looks the same in Nominativ and Akkusativ for neuter. In those ambiguous slots, the adjective steps in with a strong ending to carry the gender/case information the article omits.
| Case | Masculine | Feminine | Neuter | Plural |
|---|---|---|---|---|
| Nominativ | -er | -e | -es | -en |
| Akkusativ | -en | -e | -es | -en |
| Dativ | -en | -en | -en | -en |
| Genitiv | -en | -en | -en | -en |
Example: ein großer Hund / eine große Katze / ein großes Haus
After the indefinite article — the adjective must show gender in Nominativ masc. and Nom./Akk. neut. (strong slots).
Amber cells mark strong endings — where the adjective carries the case/gender signal.
Table 3 — Without article
No article at all — nothing carries the gender/case signal. The adjective must do it in every cell. The endings are the same as the definite article forms: der → -er, die → -e, das → -es, dem → -em. If you know the articles, you already know these endings.
| Case | Masculine | Feminine | Neuter | Plural |
|---|---|---|---|---|
| Nominativ | -er | -e | -es | -e |
| Akkusativ | -en | -e | -es | -e |
| Dativ | -em | -er | -em | -en |
| Genitiv | -en | -er | -en | -er |
Example: großer Hund / große Katze / großes Haus
No article — the adjective takes all the strong endings to carry case and gender information.
Amber cells mark strong endings — where the adjective carries the case/gender signal.
Comparatives and superlatives — the regular pattern
Most adjectives follow a regular pattern: add -er for the comparative and am -(e)sten for the superlative. One-syllable adjectives with a, o, or u often umlaut in the comparative — but not always. The exceptions matter and are listed below.
Note: adjectives ending in -t, -d, -s, -ß, -z insert an -e- before the superlative -sten: "am ältesten", "am heißesten".
Irregular comparatives — the five to memorise
Five very common adjectives have irregular comparative and superlative forms that must be learned individually:
| Base | Meaning | Comparative | Superlative |
|---|---|---|---|
| gut | good | besser | am besten |
| viel | much / many | mehr | am meisten |
| hoch | high | höher | am höchsten |
| nah | near / close | näher | am nächsten |
| gern | gladly / like to | lieber | am liebsten |
Adjectives that don't take an umlaut
Several one-syllable adjectives with a, o, u look like they should umlaut in the comparative but do not. These must be memorised:
| Base | Meaning | Comparative | Superlative |
|---|---|---|---|
| bunt | colourful | bunter | am buntesten |
| froh | glad / happy | froher | am frohsten |
| voll | full | voller | am vollsten |
| rund | round | runder | am rundsten |
| wahr | true | wahrer | am wahrsten |
| flach | flat | flacher | am flachsten |
| klar | clear | klarer | am klarsten |
Predicate vs attributive adjectives
The single most common adjective mistake is applying an ending where none is needed. Adjectives split into two types depending on their position: those before a noun (attributive) always need endings; those after a linking verb (predicate) never do.
Attributive — before noun
Der große Hund bellt.
"große" — adjective before noun, takes -e ending (definite table, Nom masc)
Predicate — after sein
Der Hund ist groß.
"groß" — after sein, no ending at all regardless of gender or case
The test is positional: is the adjective sitting directly in front of a noun? If yes, it takes an ending. Does it come after sein, werden, bleiben, wirken, or aussehen? Then it is predicative — zero ending, regardless of gender or case.
More examples:
- Die kleine Katze schläft. (attributive — before noun)
- Die Katze ist klein. (predicate — no ending)
- Ich kaufe ein neues Auto. (attributive — indef. article, neut. Akk)
- Das Auto wirkt neu. (predicate — no ending)
Common adjective ending mistakes
Adding endings to predicate adjectives
Only attributive adjectives (before nouns) take endings. "Der Hund ist groß" — no ending on groß. "Der große Hund" — -e ending. Predicate adjectives after sein, werden, bleiben never inflect.
Using definite endings after "ein"
"Ein alte Mann" is wrong — "ein" leaves the masculine Nom slot open, so the adjective must fill it: "ein alter Mann". The indefinite article table exists precisely because "ein" is gender-ambiguous in certain slots.
Forgetting endings on comparative adjectives
Comparatives used attributively still need endings: "ein schnelleres Auto" (not "ein schneller Auto"). The -er of the comparative is part of the stem — then add the declension ending on top.
Over-applying umlaut in comparatives
Not all one-syllable adjectives take an umlaut in the comparative. "Froh → froher" (not "fröher"), "bunt → bunter" (not "bünter"). When unsure, check the reference list of no-umlaut adjectives.