1. superlative form of slim: thinnest in width or having the least body fat
2. superlative form of slim: smallest in amount or degree; most minimal

Examples

• She was the slimmest person in her family.
• The slimmest book on the shelf was a poetry collection.
• He had only the slimmest chance of winning the lottery.
• The slimmest margin of victory in the election was just three votes.
• Among all the models, she had the slimmest figure.
• The slimmest hope remained that they would find survivors.
• This is the slimmest phone available on the market.