Insufficiency or shortage; a lack or deficit of what's needed (resources, time, funds, etc.).
睡眠不足で集中力が落ちた。
Lack of sleep lowered my concentration.
資金不足のため、プロジェクトを延期した。
The project was postponed due to a lack of funds.
栄養不足は健康に深刻な影響を与える。
Nutritional deficiency has serious effects on health.
Dissatisfaction or complaint; a feeling that expectations or demands are not being met.
市民は行政の対応に不足を感じている。
Citizens feel dissatisfied with the administration's response.
従業員は待遇の不足を訴えた。
Employees complained about insufficient working conditions/compensation.
彼は結果に不足を感じ、さらなる改善を求めた。
He felt unsatisfied with the results and demanded further improvements.