noun
Japanophobia; fear of Japan
Rare term for an irrational fear or dislike of Japan or Japanese things.
彼は恐日病で、日本文化を避けている。
He has Japanophobia and avoids Japanese culture.
嫌日 is a more general term for dislike of Japan, whereas 恐日病 specifically implies a phobia.
Compound of 恐 (fear), 日 (Japan), and 病 (disease/syndrome), modeled after terms like 恐水病 (hydrophobia).