Learn Dutch: Het is zinloos om te schreeuwen in de woestijn. - It is pointless to scream in the desert.

It combines the noun zin (sense or point) with the suffix -loos (without). This suffix is highly productive in Dutch, letting you create adjectives that indicate an absence, just like '-less' in English. Here, it translates perfectly to 'pointless'.

Doesn't the word zin usually mean 'sentence'?

Zin has multiple meanings in Dutch. While you probably first learned it as 'sentence', it also means 'sense', 'meaning', or 'point' (as in Dat heeft geen zin - That makes no sense / That has no point). In zinloos, it is this meaning that is being used.

Why is om used before te schreeuwen?

When a sentence starts with a dummy subject and an adjective expressing an opinion or evaluation (like Het is zinloos), Dutch strongly prefers to use om te + infinitive for the action that follows. You could technically drop om, but including it sounds much more natural.

Could I put in de woestijn before the verb, like om in de woestijn te schreeuwen?

Yes, you can! Both word orders are completely fine. However, placing a prepositional phrase of place at the very end of the sentence (after te schreeuwen) is very common in spoken Dutch because it breaks up a long block of verbs and phrases, making the sentence flow more easily.