IPA: /ˈslaɪtɪst/
KK: /slaɪtɪst/
The smallest amount or degree; not much at all.
She didn't show the slightest interest in the proposal.
Slightest → It is formed from "slight" (from Old English *slyht*, meaning small or insignificant) and the suffix "-est" (used to form the superlative degree). The word "slightest" means the smallest or least amount of something.
Think of something that is 'small' or 'insignificant' ('slight') and remember that 'slightest' refers to the smallest degree of that quality.
No commonly confused words.