also: かぶそく
noun
excess or deficiency; too much or too little
Typically used in negative constructions to mean 'without excess or deficiency', i.e., just the right amount. Often appears as 過不足なく or 過不足のない.
材料を過不足なく計量する。
Measure the ingredients without excess or deficiency.
この説明書は過不足のない内容だ。
This manual has just the right amount of information, neither too much nor too little.
Compound of 過 (excess) and 不足 (deficiency). The reading かふそく reflects the older kana usage for ふ (historically pronounced 'fu'), while かぶそく is a modern variant.