Duo Russian Grammar

62) Adjectives 3

Russian has a number of adjectives formed from other types of words, for examples, nouns. Where English might use a noun chain or a few nouns stitched together ("summer shirt", "homework"), we often use an adjective—of course, if the language has one («летняя рубашка», «домашняя работа»).

Adjectival declension

Here is the full table:

ENDINGS m n f pl
Nom. -ый(о́й)/ ‑ий -ое/ ‑ее ‑ая/ ‑яя -ые/-ие
Acc. Nom. or Gen. -ое/ ‑ее -ую/ ‑юю Nom. or Gen.
Gen. -ого/‑его see m. -ой/-ей -ых/-их
Prep. -ом/-ем see m. -ой/-ей -ых/-их
Dat. ‑ому/‑ему see m. -ой/-ей -ым/-им
Instr. -ым/-им see m. -ой/-ей ‑ыми/ ‑ими

знакомый

«Знакомый» is a word for "familiar", also widely used as a noun for "pal, acquaintance" (знакомый for males, знакомая for females)