How do you say forget in Japanese?
— 忘れる (わすれる, wasureru)

Generic synonyms for forget in Japanese
drop雫 (shizuku)
Antonyms for forget in Japanese
mind心 (こころ, kokoro), 精神 (せいしん, seishin), 知性 (ちせい, chisei)
remember思い出す (おもいだす, omoidasu); 覚える (oboeru)