Describing a Characteristic

In Serbian, the генитив особине (also known as описни or квалификативни генитив) is an expressive and often stylistically refined grammatical construction used alongside ordinary adjectives and prepositional phrases to describe inherent physical or character traits, dimensions, or temporary dispositions and states (such as бити доброг расположења 'to be in a good mood' or бити доброг здравља 'to be in good health') in a person or object.

1. Syntactic Functions:
• Attribute modifying a noun: Canonically placed directly after the head noun it describes in standard language: девојка дуге косе ('a girl with long hair'), човек ведрог духа ('a man of cheerful spirit'). Note that placing the genitive modifier before the head noun (e.g., *дуге косе девојка) is strictly ungrammatical in neutral standard prose; such preposing is reserved for traditional epic poetry or heightened poetic license.
• Predicate complement: Functions as a descriptive predicate complement with the copula бити across tenses and moods: Он је ведрог духа, Данас је добре воље ('Today he is in good spirits'), Биће ведрог духа, Био би ведрог духа, Мора бити ведрог духа.
• Adverbial modification of manner / attendant circumstance: Expressions of bodily posture or state such as ходао је уздигнуте главе ('he walked with his head held high') or седела је скрштених руку ('she sat with her arms crossed') are syntactically classified in Serbian grammar as qualitative genitives (квалификативни генитив) functioning adverbially to specify the attendant manner or disposition of the subject during the action.

2. The Obligatory Determination Constraint (Обавезна детерминација):
Unlike relational or partitive genitives where an isolated noun stands alone (e.g., кров куће, зид собе), the qualitative genitive cannot stand entirely undetermined (*човек карактера). However, this syntactic requirement is satisfied by any qualifying determiner: it can be a descriptive adjective or quantifier (човек чврстог карактера), a pronominal determiner (човек таквог кова, писац тог ранга), or even a relative clause modifying the genitive noun (човек карактера какав се ретко среће). When an adjective or pronominal determiner is used, it agrees fully in gender, number, and case via adjective agreement (e.g., feminine singular девојка дуге косе, neuter singular човек племенитог срца, feminine plural младић плавих очију — note that singular око is neuter, but its plural очи inflects as a feminine i-stem noun taking feminine plural agreement).

3. Contrasting with Other Descriptive Constructions:
• Compound Adjectives (Сложени придеви): For physical attributes, a qualitative genitive construction very commonly alternates with a compound adjective formed with a connective vowel -о-: девојка дуге косе = дугокоса девојка; младић плавих очију = плавооки младић; старац седе браде = седобради старац.
• 'Од + генитив': When a character trait, quality, or material composition is expressed by a single noun without an accompanying determiner, standard Serbian frequently uses the prepositional qualitative genitive with од: човек од речи ('a man of his word'), човек од части ('an honorable man'), човек од челика ('a man of steel'). Both a determined bare genitive (човек чврстог карактера) and a prepositional genitive (човек од карактера) are natural standard expressions.
• 'Са + инструментал': Physical traits can readily alternate between the genitive of characteristic and qualitative instrumental with 'са' (девојка дуге косе = девојка са дугом косом). However, detachable accessories require са (човек са шеширом, not *човек шешира), whereas abstract character and moral virtues prefer the genitive of characteristic (човек великог поштења rather than *човек са великим поштењем).