In Russian, noun gender is usually predictable based on the ending. However, there are two fascinating groups that break the standard rules: Common Gender nouns and Indeclinable nouns.
Some nouns ending in -а or -я describe qualities or roles of people. Their gender is "fluid"—it depends entirely on the sex of the person being described. Adjectives and verbs must agree with the person's biological gender.
Examples:
Он горький пьяница. (On gor’kiy p’yanitsa.) – He is a confirmed drunkard. (Masculine agreement)
Она горькая пьяница. (Ona gor’kaya p’yanitsa.) – She is a confirmed drunkard. (Feminine agreement)
Говорите со мной, как с круглой невеждой. (Govorite so mnoy, kak s krugloy nevezhdoy.) – Speak to me as to a complete ignoramus.
Many loanwords ending in vowels (like -о, -е, -и, -у, -ю, -а) do not change their form for cases or numbers. You must determine their gender based on specific categories.
Most foreign inanimate objects are neuter.
Note: кофе (kofe – coffee) is traditionally masculine (крепкий кофе / strong coffee).
Gender usually follows the person's sex.
Generally masculine unless the context specifically refers to a female.
These take the gender of the generic noun they represent (city, river, island, etc.).
Acronyms that can be pronounced as words often take the gender of their ending or the main word in the phrase.
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