小人閑居して不善をなすidle hands are the devil's workshop; an idle brain is the devil's shop
積不善の家には必ず余殃ありevil deeds bring retribution on one's descendants
者
は
罰
せ
られる
べき
だ
。
Those who commit evil deeds should be punished.
不善感
negative reaction; unsuccessful vaccination
Etymology
Compound of 不 (ふ, 'not') and 善 (ぜん, 'good'), literally 'not good'. The word follows a common Sino-Japanese pattern for forming abstract nouns denoting the absence of a positive quality.
