Sometimes you can guess the meaning of a difficult word. See if:
– the word or part of the word looks like a Dutch word you know;
news > nieuws
tonight > vannacht
– the word looks like a word you know in another language, like French;
grand = grande (FR) = groot, groots
– you know part of the word in English. unhappy > ongelukkig
Use a dictionary if you are not sure.