IPA: /ˈpeɪsi/
KK: /ˈpeɪsi/
The most quick or lively in movement or action.
She is the paciest runner in the team, always finishing the race first.
Comparative: pacier
Superlative: paciest
Paciest → It is formed from "pace" (from Latin "pax", meaning peace) and the suffix "-est" (indicating the superlative degree). The word "paciest" means the most peaceful or the one who has the greatest peace.
Think of 'peace' ('pax') and remember that 'paciest' means the most peaceful.
No commonly confused words.