

部長はよく会議で冗談を言います。
真面目な話の時に冗談を言うのはやめたほうがいいよ。
ちょっと冗談を言っただけだよ、怒らないで。
"じょうだんをいう(冗談を言う)" is in the lesson "Verbs 5" (Level 17), 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.