-ски / -чки / -шки

Relational adjectives (односни придеви) derived with -ски, -чки, and -шки are one of the most productive adjective classes in Serbian. They define categorical origin, provenance, or institutional association.

1. Choosing the Suffix Variant and Sound Changes:

• -ски (-ski): The default suffix used after most consonants (e.g., град → градски, школа → школски). Note that feminine nouns ending in -а drop this inflectional ending, attaching the suffix directly to the consonant base (e.g., жен-а → женски). Stems ending in voiced consonants devoice before -s- in writing and speech (e.g., Срб- + -ски → српски). Proper nouns ending in a vowel whose declensional oblique stem incorporates -ј- retain that stem consonant (e.g., Токио, gen. Токија → токијски), whereas stems that already end in the consonant /j/ simply add the suffix directly (e.g., Уругвај → уругвајски). Important orthographic exceptions: The voiced dental consonant -д- is preserved in spelling before -с- (e.g., град → градски, суд → судски, брод → бродски, људски), even though it regularly assimilates phonetically in pronunciation to [t] ([ˈɡratski]). Similarly, dental -т- is strictly retained in spelling before -ски without cluster loss (e.g., брат → братски, Хрват → хрватски, спорт → спортски; never *брацки). Consonant clusters simplify with stems ending in -s or -z (e.g., Рус → руски; Париз → париски). After stems ending in affricates like -ћ, the suffix -ски sheds its initial -с-, leaving -ки (e.g., младић + -ски → младићки).
• -чки (-čki): Derived through distinct phonological processes depending on the final stem consonant:
  • Stems ending in the velar consonant -к palatalize to -ч- (e.g., радник → раднички).
  • Stems ending in the dental affricate -ц change to -ч- alongside cluster reduction of -ц + -ски to -чки (e.g., Немац → немачки). Stems in -ица follow this exact pattern after dropping the feminine ending -а (e.g., Суботиц-а → суботички, Лозниц-а → лознички, кукавиц-а → кукавички).
  • Stems that already end in the postalveolar affricate -ч simply drop suffix-initial -с- without altering the stem consonant (e.g., Беч + -ски → бечки).
• -шки (-ški): Used after the velar consonants -г and -х, as well as postalveolar fricatives -ш and -ж. For instance, Праг → прашки; Чех → чешки; Ниш → нишки; муж → muški (мушки).

2. Definite Form and Gradability:
Unlike purely descriptive adjectives, which alternate between short (indefinite) and long (definite) forms, adjectives in -ски / -чки / -шки belong strictly to the definite adjective aspect. The masculine nominative singular always ends in -и (e.g., градски, never *градск). When used in a strictly classifying or relational sense (e.g., српски сир, градски превоз), they denote categories and do not form a comparative or superlative. However, when an adjective of this class acquires a qualitative meaning denoting human traits or manners, it can regularly form comparatives with -ији (e.g., људски → људскији, другарски → другарскији).

3. Adverbial Usage:
Forms ending in -ски, -чки, and -шки also function as default manner adverbs without any extra suffix. This pattern is standard when describing languages or manner of action (e.g., Говорим српски = 'I speak Serbian'; поступити људски = 'to act humanely').

4. Capitalization Rules:
Unlike in English, adjectives derived from proper geographical or national names are written with a lowercase initial letter (e.g., српски језик, београдске улице). They only take a capital letter when they appear at the start of a sentence or form the first word of an official multi-word proper noun (e.g., Београдски универзитет).

5. Category vs. Personal Possession:
Do not confuse relational adjectives with possessive adjectives ending in -ов/-ев/-ин. Use -ски for a generic role or field (e.g., професорски посао = 'professorial work / teaching profession') and -ов for an individual's item (e.g., професорова торба = 'the professor's bag').