1. Components, parts, or aspects that lack interest, brightness, or stimulation; boring or tedious features
The presentation contained many dull elements that failed to engage the audience.
A apresentação continha muitos elementos monótonos que falharam em engajar o público.
2. In chemistry or materials science: elements that are not lustrous or shiny; elements lacking brilliance
The dull elements in the alloy reduced its reflective properties.
Os elementos opacos na liga reduziram suas propriedades reflexivas.