IPA: //ˈtʃiːfɪst//
KK: /ˈtʃifɪst/
The highest in rank or importance; the most significant or primary.
He is the chiefest among the leaders in our organization.
Chiefest → It is formed from "chief" (from Old French *chief*, meaning leader or head) and the suffix "-est" (meaning most). The word "chiefest" means the most important or highest in rank or authority.
Think of the word 'chief' as the leader or head, and remember that 'chiefest' means the most important or highest among leaders.
No commonly confused words.