1. An action or deed performed without deliberate intention or conscious purpose; something done by accident or mistake
Breaking the vase was an unintentional act; I didn't mean to knock it over.
Quebrar o vaso foi um ato involuntário; não pretendia derrubá-lo.
2. In legal contexts, an action that occurs without mens rea (criminal intent), often resulting in reduced liability
The judge ruled that the harm caused was an unintentional act, so the sentence was lighter.
O juiz determinou que o dano causado foi um ato involuntário, então a sentença foi mais leve.