IPA: /ˈslɪpiɪst/
KK: /ˈslɪpiɪst/
The most slippery; having a surface that is difficult to hold or walk on without slipping.
The slippiest part of the trail was covered in ice, making it hard to walk safely.
Comparative: slippier
Superlative: slippiest
Slippiest → It is formed from "slip" (from Old English *slipan*, meaning to glide or slide) and the suffix "-iest" (meaning the most). The word "slippiest" means the most likely to glide or slide, indicating a high degree of slipperiness.
Think of something that glides or slides easily ('slip') and remember that 'slippiest' means the most slippery.