Greek Adjectives: How to Make Them Agree with Nouns (With Examples)

In English, an adjective never changes. A good friend, a good house, good friends. In each example, the word “good” stays exactly the same. However in Greek, an adjective copies the gender, number, and case of the noun it describes, which means its ending shifts depending on what it’s attached to. Once you get to grips with this rule, everything around adjectives starts clicking into place.

Most explanations bury adjective agreement inside a longer chapter on noun declension. Here it gets the standalone treatment it deserves, because the rule is short and the payoff is large. Get this one habit right and your Greek will sound much more natural straight away.

The Core Rule: An Adjective Copies Its Noun

An adjective in Greek has to match the noun it describes in three ways:

• Gender — masculine, feminine, or neuter
• Number — singular or plural
• Case — the role the noun plays in the sentence (more on this below)

You don’t choose the adjective’s form on its own. Your best clue is to look at the form of the noun. If the noun is feminine and singular, the adjective is feminine and singular too.

The clearest place to see this is the most common adjective pattern in Greek: the -ος / -η / -ο type. The adjective καλός (kalós) — good — is the model. It has three forms in the singular, one for each gender:

• καλός — masculine
• καλή — feminine
• καλό — neuter

If you’ve read about how Greek nouns split into masculine, feminine, and neuter, you’ll notice the endings line up with the noun endings you already know: -ος for masculine, -η for feminine, -ο for neuter.

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Three Genders, Three Endings

Here is the same adjective attached to a noun of each gender. Notice that the article, the adjective, and the noun all agree:

• ο καλός φίλος — the good (male) friend
• η καλή φίλη — the good (female) friend
• το καλό παιδί — the good child

The noun φίλος (fílos) — friend — is masculine, so it takes the masculine article ο and the masculine adjective καλός. Change to the feminine φίλη (fíli) — female friend — and everything shifts to the feminine: η καλή φίλη. The neuter παιδί (paidí) — child — pulls the adjectives into the neuter: το καλό παιδί.

The article is your anchor here. If you’ve learnt when to use ο, η, and το, you already know the gender of the noun, and the adjective ending follows the same logic. ο goes with -ος, η goes with -η, το goes with -ο.

A few more examples with different adjectives so the pattern sticks:

• ο μεγάλος δρόμος — the big road (μεγάλος, masculine)
• η μεγάλη πόρτα — the big door (μεγάλη, feminine)
• το μεγάλο σπίτι — the big house (μεγάλο, neuter)

Same adjective but with three endings, all dictated by the noun.

Word Order: The Adjective Comes First

In Greek, the adjective usually sits between the article and the noun, exactly as in English:

ο (article) καλός (adjective) φίλος (noun)

So the pattern is article + adjective + noun, all three matching. You can also place the adjective after the noun for emphasis or in certain set phrases, but article + adjective + noun is the version to learn first and the one you’ll use most.

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Agreement in the Plural

Number matters too. When the noun goes plural, the adjective goes plural with it. The -ος / -η / -ο type takes these plural endings:

• masculine plural: -οι
• feminine plural: -ες
• neuter plural: -α

And the article changes as well — οι for masculine and feminine plural, τα for neuter plural. Here are the three singular phrases from earlier, now in the plural:

• οι καλοί φίλοι — the good (male) friends
• οι καλές φίλες — the good (female) friends
• τα καλά παιδιά — the good children

So καλός has six forms in total across the two numbers: καλός, καλή, καλό in the singular and καλοί, καλές, καλά in the plural. That sounds like a lot to hold in your head, but they all come from one stem, καλ-, with a predictable ending bolted on. This pattern transfers to hundreds of other adjectives.

A Quick Note on Case

Greek nouns also change form depending on their job in the sentence — this is what’s meant by case. The form you’ve seen so far (ο καλός φίλος) is the nominative, used when the noun is the subject of the sentence: the one doing something.

When the noun becomes the object (the thing being acted on) it shifts into the accusative, and the adjective shifts with it. Compare:

• Ο καλός φίλος είναι εδώ. — The good friend is here. (subject → nominative)
• Βλέπω τον καλό φίλο. — I see the good friend. (object → accusative)

Notice three things changed together in the second sentence: the article (ο → τον), the adjective (καλός → καλό), and the noun (φίλος → φίλο). They move as a unit.

You don’t need to master every case to start using adjectives well. At A1, focus on getting the gender and number right in the nominative, and recognise that the endings drop their final -ς in the masculine accusative. The full case picture comes later, and it follows the same copy-the-noun logic you already understand.

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A Practical Habit

The fastest way to get the endings right is to learn adjectives in their three singular forms from the start, the way a dictionary lists them: καλός, καλή, καλό. Say all three out loud when you meet a new adjective. After a week of doing this, the right ending starts coming out automatically, because your ear has learnt that η wants -η and το wants -ο.

This is exactly the kind of thing that’s hard to self-correct from a textbook, because a book can’t hear you say το καλός σπίτι and tell you it should be το καλό σπίτι. Speaking practice with feedback — saying the phrase, getting corrected, saying it again — is where this actually becomes automatic. Speak Greek’s AI feedback on your spoken and written Greek is built around this loop: you produce a phrase, it flags the mismatched ending, and you fix it on the spot. You can try it on the first lessons for yourself — Units 1 and 2 are free, with no sign-up.

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FAQ

Do all Greek adjectives follow the -ος / -η / -ο pattern? No, but it’s the most common pattern and the best one to learn first. καλός, μεγάλος, μικρός, ωραίος and many others follow it. There are other adjective types with different endings (for example -ης / -ης / -ες and -ύς / -ιά / -ύ), but they all work on the same principle: the adjective copies the noun’s gender, number, and case. Master agreement with the -ος type and the rest is a matter of learning new endings, not a new rule.

Where does the adjective go — before or after the noun? Usually before, between the article and the noun: ο καλός φίλος. This is the order to learn first. Greek does allow the adjective after the noun in some contexts, but article + adjective + noun is the everyday pattern.

What happens to the adjective after the verb “to be”? It still agrees with the noun it describes. In Η μέρα είναι καλή (the day is good), καλή is feminine because μέρα is feminine, even though it sits after the verb είναι. Agreement isn’t about position in the sentence — it’s about which noun the adjective belongs to.

Why does the ending change in “Βλέπω τον καλό φίλο”? Because the friend is now the object of the sentence, so the whole phrase moves into the accusative case. The masculine accusative drops the final -ς, so καλός becomes καλό and φίλος becomes φίλο, with the article ο becoming τον. The article, adjective, and noun always shift together.

Is getting adjective endings wrong a serious mistake? It won’t usually stop you being understood, but the wrong ending stands out to a native speaker, a bit like saying “she good” instead of “she is good” in English. The good news is that it’s a pattern, not a list to memorise, so it becomes reliable with a little focused practice.