

事故の原因はいまだわかっていないそうです。
彼からの返事はいまだに届いていません。
その問題はいまだ解決されていないんですか。
"いまだ(未だ)" is in the lesson "Adverbs 2" (Level 31), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.