IPA: /ˈslɪməst/
KK: /slɪmɪst/
The smallest in size or amount when compared to others; very thin.
She wore the slimmest dress at the party, making her look elegant.
Comparative: slimmer
Superlative: slimmest
Slimmest → It is formed from "slim" (from Middle English "slim", meaning slender or thin) and the superlative suffix "-est" (meaning most). The word "slimmest" means the most slender or thin among a group.
Think of the word 'slim' to remember that 'slimmest' means the most slender or thin.