Question 1

Why do зануда and непоседа both end in -а, but take different gender adjectives (такая vs настоящий)?

Accepted Answer

These are called common gender nouns (общий род). They usually end in -а or -я like feminine nouns, but they adopt the grammatical gender of the person they describe. Here, зануда refers to a girl, so it takes the feminine такая. Непоседа refers to a boy (брат), so it takes the masculine настоящий.

Question 2

Could I say такой зануда if I were talking about a boy?

Accepted Answer

Yes, exactly! If you were describing a male, you would say Этот мальчик — такой зануда. The noun зануда itself doesn't change its spelling, but any adjectives or pronouns modifying it must switch to masculine.

Question 3

Even though непоседа takes masculine adjectives here, how does it decline for other cases?

Accepted Answer

It declines exactly like a regular feminine noun ending in -а, regardless of who it refers to. The adjectives modifying it take masculine case endings, but the noun takes feminine declension endings. For example, in the genitive case (meaning "of a real fidget"), you would say настоящего непоседы.

Question 4

Why are there em-dashes (—) in both halves of the sentence?

Accepted Answer

This is a standard punctuation rule in Russian. When both the subject and the predicate of a sentence are nouns in the nominative case, you use a dash to replace the present tense verb "to be" (is/are). Here, the dashes connect девочка (subject) to зануда (predicate) and брат to непоседа.

Эта девочка — такая зануда, а её брат — настоящий непоседа.

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