-ский

• -ьский (-ʹskij) (after /л/), -йский (-jskij) (after a vowel), -цкий (-ckij) (with stems in /к/ and /ц/)
• -ско́й (-skój) (when stressed), -ьско́й (-ʹskój) (when stressed after /л/), -цко́й (-ckój) (when stressed with stems in /к/ and /ц/, unproductive)

Inherited from Old East Slavic -ьскъ (-ĭskŭ), from Proto-Slavic *-ьskъ.

• IPA^(key): [skʲɪj]
• IPA^(key): [skəj] (obsolete Moscow norm; nearly extinct since the mid-20th century)

-ский • (-skij)

1. Used to form adjectives from nouns or sometimes other adjectives, often relational (meaning "related to X"): -ian, -ic, -ish

   ‎А́нглия (Ánglija, “England”) + ‎-ский (-skij) → ‎англи́йский (anglíjskij, “English”)

   ‎Русь (Rusʹ, “Rus”) + ‎-ский (-skij) → ‎ру́сский (rússkij, “Russian”)

   ‎ара́б (aráb, “Arab”) + ‎-ский (-skij) → ‎ара́бский (arábskij, “Arabic, Arabian, Arab”)

   ‎изда́тель (izdátelʹ, “publisher”) + ‎-ский (-skij) → ‎изда́тельский (izdátelʹskij, “publisher (relational)”)

   ‎депута́т (deputát, “deputy”) + ‎-ский (-skij) → ‎депута́тский (deputátskij, “deputy (relational)”)

   ‎зверь (zverʹ, “beast; brute”) + ‎-ский (-skij) → ‎зве́рский (zvérskij, “brutal, savage”)

   ‎геро́й (gerój, “hero”) + ‎-ский (-skij) → ‎геро́йский (gerójskij, “heroic”)

   ‎монго́л (mongól, “Mongol”) + ‎ьский (ʹskij) → ‎монго́льский (mongólʹskij, “Mongolian”)

• Historically triggered the first Slavic palatalisation, cf. гре́цкий (gréckij), оне́жский (onéžskij), че́шский (čéšskij). However, in the modern literary language it has been replaced by the Church Slavonic variant -еский (-eskij) in most old formations. In modern formations, -ский after unmodified velars is used, e. g. ба́скский (báskskij), стра́сбургский (strásburgskij), каза́хский (kazáxskij).
• Always triggers palatalisation for stems in /л/.
• The adverb is -ски (-ski).
• Historically pronounced as an unstressed -ской (-skoj) and sometimes also spelled as such. In early modern poetry, such as in Pushkin, rhyming of -ский (-skij) with -ой can be found. This pronunciation became obsolete during the 20th century.

• -ски (-ski)
• -еский (-eskij)
• -и́йский (-íjskij)
• -евский (-evskij)
• -ческий (-českij), -и́ческий (-íčeskij)