More N1 vocabulary

• 感染かんせんinfection; contagion
• 打ち合わせるうちあわせるto knock together; to arrange
• 苛々いらいらgetting nervous; irritation
• 難いかたいdifficult; hard
• 錯覚さっかくoptical illusion; hallucination
• 万ばんmany; all