What does 滞納 mean?
滞納 is a Japanese noun meaning “non-payment, default” in English. It is written as 滞納 in kanji, たいのう in hiragana, and tainou in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
数日ならまだしも１０日も滞納している。
A few days would have been excusable, but you are in arrears for 10 days.