Learn Italian: L'isola è sicura.

In Italian, adjectives must match the noun they describe. Because isola (island) is a feminine singular noun, the regular adjective sicuro changes its ending to -a to become sicura.

I thought the word for the before feminine words was la. Why is it L'isola?

You are right! The definite article for feminine singular words is la. However, because isola starts with a vowel, the a in la gets dropped and replaced with an apostrophe to make it easier to say. So, la isola becomes l'isola.

How would this sentence change if I wanted to say that the islands are safe?

Everything needs to become feminine plural! L'isola becomes le isole, the verb è (is) becomes sono (are), and the adjective sicura changes its -a to an -e to become sicure. The full plural sentence is: Le isole sono sicure.

Can sicura mean anything else besides safe?

Yes! Depending on the context, sicura can also mean sure or certain. In this sentence, translating it as the island is certain does not make much sense, so safe is the correct meaning here.