IPA: /ˈslɪp.i.ər/
KK: /ˈslɪpɪər/
More slippery than something else; having a surface that is more difficult to hold or walk on without slipping.
The ice on the road was slippier than I expected, making it hard to drive safely.
Comparative: slippier
Superlative: slippiest
Slippier → It is formed from "slip" (from Old English *slipan*, meaning to slide or glide) and the comparative suffix "-ier" (indicating a higher degree). The word "slippier" means more likely to slip or slide compared to something else.
Think of something that is more likely to 'slide' ('slip') — that's why 'slippier' means it slips more easily.