1. most serious and thoughtful; most grave or earnest
Usage: superlative form of sober
2. most restrained or subdued in style, color, or manner
Usage: superlative form of sober
3. most free from the influence of alcohol; most abstinent
Usage: superlative form of sober

Examples

• She wore her soberest dress to the funeral.
• His soberest expression appeared when discussing the company’s losses.
• The soberest member of the group always drove everyone home.
• The judge’s soberest tone indicated the gravity of the situation.
• Among all the decorating choices, hers was the soberest.
• He gave his soberest assessment of the political crisis.