Genitive Adjectives Singular

This is one of the simpler aspects of the Genitive, since the endings do not change much

Masculine and neuter adjectives will have the ending replaced with -его or -ого

Most of the times will be ого unless it ends with ж, ч, ш, ц, щ, then it would be его, if the ending is not stressed then you would still use ого.

• Adjectives ending in -ый and -ой

  удивительный becomes удивительного for example

  у книги нет удивительного конца

• Here even though it ends in ш the vowel that comes after is stressed, so we still use -ого

  большо́й becomes большо́го (because ending not stressed)

• The vowel is not stressed so we use -его

  хоро́ший becomes хоро́шего

• Lastly, the soft adjectives which all end in -ний use -его

  после́дний becomes после́днего

Feminine adjectives will end in -ой or -ей (this is the same as in the prepositional)

• чёрная собака becomes чёрной собаки