

今回の事故は、管理者の怠慢が原因だと言わざるを得ません。
これは単なる個人の怠慢ではなく、組織の問題ではないでしょうか。
確認を怠ったのは、明らかに私の怠慢でした。
"たいまんな(怠慢な)" is in the lesson "Negative traits" (Level 27), along with 9 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.