1. A reason or basis for an action, decision, or belief that lacks valid justification or reasonable support
The company's decision to fire him was based on unjustified ground.
A decisão da empresa de demiti-lo foi baseada em motivo injustificado.
2. In legal contexts, a basis for legal action that is not supported by evidence or law
The lawsuit was dismissed because the plaintiff had no unjustified ground for the claim.
O processo foi arquivado porque o autor não tinha motivo injustificado para a reclamação.