Adjectives have only one form. Persian does not have grammatical gender. Therefore, adjectives do not have masculine, feminine or neuter forms. Additionally, adjectives do not agree in number with the noun they modify. Therefore, adjectives do not have plural forms.

In Persian, adjectives are not a distinct class of words. They belong to a larger class that can function as an adjective or an adverb depending on the word they modify. When they modify a noun, they act as an adjective and when they modify other types of words, they act as an adverb. German and Dutch are among other languages that have this grammatical feature. Adjectives can also be nominalized and function like a noun.

Predicate Adjectives

A predicate adjective is an adjective that modifies the subject of a verb. For example, “happy” in “He is happy” is a predicate adjective. This contrasts with “A happy boy” where “happy” is called an attributive adjective.

هوا سرد است
Havâ sard ast
The weather is cold
این پیراهن گران است
In pirâhan gerân ast
This shirt is expensive
آن پسرها خوشحال به نظر می‌آيند
Ân pesarhâ khoshhâl be nazar miâyand
Those boys seem happy

Attributive Adjectives

Attributive adjectives come after the noun they modify and are related to it with the genitive marker “e”. In English, attributive adjectives come before nouns. Spanish, French and Italian are among other languages in which adjectives typically come after the noun they modify.

دوست خوب
dust-e khub
good friend
دوستان خوب
dustân-e khub
good friends
اتاق ارزان
otâgh-e arzân
cheap room

When a noun ends in a vowel, the genitive marker transforms to “ye” to resolve vowel hiatus.

خانه‌ی بزرگ
khâne-ye bozorg
big house
هوای سرد
havâ-ye sard
cold weather
غذاهای خوش‌مزه
ghazâhâ-ye khoshmazze
delicious foods