IPA: /ˈsloʊəst/
KK: /sloʊɪst/
The least fast; moving or happening at a low speed.
The tortoise is the slowest animal in the race.
Comparative: slower
Superlative: slowest
Slowest → It is formed from "slow" (from Old English "slāw", meaning not quick) and the suffix "-est" (used to form the superlative degree). The word "slowest" means the least quick or the lowest speed among a group.
Think of the word 'slow' meaning not quick, and remember that 'slowest' describes something that is the least quick of all.
No commonly confused words.