恼火 (nǎo huǒ) means 'annoyed, riled up' — a colloquial, everyday word for being irritated by a specific thing. It's less intense than 愤怒 (fèn nù) or 气愤 (qì fèn), which mean 'furious/indignant', and more narrowly about irritation than 烦 (fán), which also means 'tedious' or 'to bother'. 苦恼 (kǔ nǎo) is more about distress and worry, not just annoyance.