'interest' is feminine. The masculine equivalent is 'intéresant
je suis en colère is neither feminine nor masculine. It means 'I am angry'. The fact this is a boy - or a girl - speaking would not turn the phrase into masculine or feminine. Only nouns and the related adjectives have a gender in French, but not the sentences (even if there had been a noun in it)
La Finlande (feminine, singular name)
The culture and society of South Africa is quite masculine in its makeup. There are a few feminine overtones, but men rule for the most part.
Le français (masculine), la française(feminine)
A sloven is another name for an untidy or haphazard person. There is no feminine or masculine of sloven as it is not gender specific.
Feminine
its masculine no doubt
Masculine
masculine
feminine
Feminine.
La pizarra is feminine, (el) is masculine, and (la) is feminine.
Une école feminine
it is masculine so El
directeur → masculine directrice→ feminine
feminine
masculine