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simple; easy; uncomplicated
brief; quick; light
この数学すうがくの問題もんだいは簡単かんたんに解けとけますね。
This problem is easy, isn't it?
出張しゅっちょう前まえに簡単かんたんな食事しょくじを済ますませた。
I had a quick meal before the business trip.
簡単かんたんに説明せつめいしてください。
Please explain it simply.