の無さ

lack of

→ の
phrase Rare #37,550
lack of Forms a noun phrase meaning the lack or absence of the quality or thing expressed before の. Often used when criticizing or reacting negatively to someone's lack of a trait, ability, or motivation.
JA: 彼女の準備の無さには困った。
EN: Her lack of preparation caused problems for me.

彼は彼らのやる気の無さ激怒した

He was furious at their lack of motivation.

クララ責任感の無さには頭に来る

Clara's lack of responsibility really gets on my nerves.

彼の仕事を判断するには経験の無さ考慮すべきだ

We should take his lack of experience into account when evaluating his work.