1. Hazy, cloudy, or unclear in form or appearance
The nebulous cloud formations stretched across the sky.
As formações de nuvens nebulosas se estendiam pelo céu.
2. Vague, ill-defined, or lacking clear form in thought or expression
His nebulous plan lacked specific details and concrete steps.
Seu plano nebuloso carecia de detalhes específicos e passos concretos.
3. Relating to or resembling a nebula (in astronomy)
The telescope revealed nebulous structures in deep space.
O telescópio revelou estruturas nebulosas no espaço profundo.