Learn Italian: L'insegnante è molto antipatico oggi. - The teacher is very unpleasant today.

Insegnante is a noun that ends in -e, meaning it can be either masculine or feminine. We have to look at the adjective antipatico to figure it out! Because it ends in -o, we know this is a male teacher. If it were a female teacher, the sentence would end with antipatica.

Why is the article L' instead of Il or La?

In Italian, when a singular definite article (the words for "the", like lo or la) comes before a noun starting with a vowel, it drops its own vowel and merges with the noun using an apostrophe. Because insegnante starts with an i, the article becomes L'.

If the teacher were female, would molto change to molta?

No, it would stay exactly the same. When molto is used as an adverb meaning "very" (placed right before an adjective like antipatico), it never changes its ending. It only changes endings to match gender and number when it means "much" or "many" and describes a noun.

Does antipatico mean "antipathetic"?