“difficult / disaster” in Japanese is 難, read nan, kata, muzu (なん, かた, むず). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 困難 (difficulty).
What does 難 mean?
この問題はとても難しい。
Same sound, different character — the classic trap. Compare them side by side: